SUMMARY Korganizer correctly finds the calendars available on iCloud (caldav.icloud.com), but does not sync with them. STEPS TO REPRODUCE Note: you will need to have an apple ID. Creating one should be fairly easy. You probably also need to create a calendar on www.icloud.com if you don't have one. 1. Go to https://appleid.apple.com/account/manage , and under "App-Specific Passwords" select "generate password" (the label you give is not important). Take note of the password. 2. In Korganizer, add a new calendar of type "DAV groupware resource" 3. When prompted for user and password, enter your apple ID and the password generated in (1) 4. Select "Configure the Resource Manually" 5. In the resulting dialog, under "server configuration", press "Add" 6. In the "Remote URL" field, put "caldav.icloud.com", and press the "Fetch" button 7. It should correctly find all your iCloud calendars and any calendars shared with you. 8. Press ok, give a Display name, and close the dialog 9. Try to sync/view the resulting calendar(s) OBSERVED RESULT Despite showing up in the list of calendars, there are no events, and it doesn't seem to sync anything EXPECTED RESULT Correctly syncs with events on the icloud calendars SOFTWARE/OS VERSIONS Linux/KDE Plasma: Archlinux (available in About System) KDE Plasma Version: 5.21.3 KDE Frameworks Version: 5.80.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION I am happy to provide further information, although I'm not so familiar yet with the KDS stack so I'm not sure how to access more detailed logs.
Confirming this bug, and providing some data from akonadiconsole showing what seems to be happening (dsid and calendar id obfuscated intentionally, by me); [2021-03-26T06:08:10.420Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/04639E57-12B4-45C1-9F4F-AC132FA40E91.ics" [2021-03-26T06:08:10.420Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/047d2a61b4586ea18c7397d7de9043946bfc35aa.ics" [2021-03-26T06:08:10.420Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/07345134-D0CD-4B3D-80C2-5A6DDB3F9FDA.ics" [2021-03-26T06:08:10.420Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/074ec2094e3448565e18934b54b6682c.ics" [2021-03-26T06:08:10.420Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/09461172-B93F-4F2F-A138-254773FE62F9.ics" [2021-03-26T06:08:10.420Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0997276272684cfe1446568dbebcb2017495934b.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/09ADF0D8-B3B6-4B53-A580-A7561C225D86.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0B6DBFCB-7579-4296-B656-54AA1AAAD738.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0C1EF490-5E0C-4B20-8BB5-6FA606B29190.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0C623A49-0B4B-4E3F-B891-2245056A5183.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0D121669-B1D1-403D-BFD2-AE151D2143D2.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0D37E88E-B4CD-42DE-96D4-6EC1B8A50C65.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0D9AAF10-7A1E-4718-942A-977958E8399A.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0F9C0D19-E1A6-4226-B824-9DE774594421.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0FD21E6A-DEF0-40BC-894E-FAB3780AC166.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/0c2cd51ac875adcd25b3af85ee0539f5.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/10990f4522b44d30264f820f85a468f90608d361.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/11210465-CD47-40F4-8D22-E5038243ECF4.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/11935F67-4D64-430F-834E-089C23452EB1.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/129C92ED-C2B3-437D-AFA8-3A5D12E78A21.ics" [2021-03-26T06:08:10.421Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/140EA79C-63BB-4262-AA5A-9BCC5DF4CDBE.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/14mnkvjs1c1ae87rqsp1rlt23a%40google.com.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/15111605be3fc502f38682f906866482098ef3e4.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1711fe36ae3b80a0f6e4fa8564369be677618cde.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/17CBEC0A-A62E-4DE6-8188-7BAFB413B1C2.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/186312999dcaf377f5729bac4dc9983dd161db4d.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/186F0430-55FF-4CE2-9BFD-761A6A11A981.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/18CD5BBA-43AF-4B25-94BB-251F07A7C53A.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/18af42d6d751d58a63d4cf8551ec9934512af930.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/19D03774-1C57-4042-B7BF-20E18663CF7E.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/19fb51686782e0385eb495cfd30bfa100aba1c28.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1A992A41-A0C2-42EF-8BF8-AC04CD53EADD.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1AA89C29-913A-4D80-9261-C51FB17D9CD4.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1AC76355-2D93-4E82-BE85-185764F6997B.ics" [2021-03-26T06:08:10.422Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1D6DB2E9-BC7F-42BD-B9FB-3F8B0C40209A.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1E28EDCB-4F34-46E7-A3CC-ACAA4C093D91.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1a030f3f5c568303aa808fa33c9651bdac44eba5.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1aa653672cf225e7521d1d8e5ae6e321d4f75afa.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1b4f39c98e321e7637dd3af8f1c9f9748db69839.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1bfb908a260b86a72ec710a7b2555a75.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/1db76238daf7d3bb3ebe90ba4b68c2b5ae53417a.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2018-03-21T055556Z-9676238%40mytimedrivercom.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/20b02868b69a82e37ca8a0870ab5241321bf361f.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/22BAAF7C-D743-4E8C-A562-753014A2D65F.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/23915564-DC92-48A6-86FA-D60A3F93CFB5.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/24CB98F7-1F09-46B9-8E7C-3A93E691538A.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/24e34721712ab553d518f105f4f6cd13.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/273EE950-041F-4A3A-B830-04497D91701C.ics" [2021-03-26T06:08:10.423Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/27586ED5-0F71-4CD1-AB42-111AD252CD11.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/27dfc63e24961ccace864df66906b5ea960f87ae.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/286612557c0e13834460978ccbd53b4606a254f8.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/28pn7kd229jnv7lh0jnnnvf3ko%40google.com.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/29059181-C239-43E0-814A-BFEB7B05E5B8.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/29158932-FE49-4D75-ADF7-37561298C158.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/29742d169fc3c17ee1b96c7349577dd5.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2AD79016-F4FC-45D6-A1F3-AD3F8BC19DFF.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2D8FB0A0-3DC5-40E1-96C2-78CF06893A58.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2F4FE179-880F-46F8-9993-518E773253B9.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2FBBE6DB-1449-49AC-8A5D-AD4DC1EAE2CB.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2a0164e39d5ca3c23acb63bce54b376e1d586e59.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2a186eba3d75c3a3ecab2cecc7217f657d7ed4be.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2b7f063f10bfb155d75144f4517675d337567b8f.ics" [2021-03-26T06:08:10.424Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2e4d752597d22280c9187617b175e72ca6d1eb9b.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2e686d4ceaaa2b96cff3b121a46f34980782de55.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2fb48dfd73377bee793d8f2b22e3984bea5e52f8.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/2lsrvs0hgaan4qqlr5qdfg0ht4%40googlecom.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/32829553-FF6C-4264-A8B4-54D3F3C2620C.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/32BB41F2-B47A-43D5-92D8-737C69829C8E.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/32b084f7b470c3edf3720339496136e9.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/335D4966-CBA7-4826-9D59-0621120D6D71.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/33dumsvk1ogup0h4050co13nf4%40googlecom.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/34223A59-9746-4595-9F41-6ACE43650FB5.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3502818F-51DB-4645-A8E3-90A3F71CB88C.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/350B603B-E9DA-48C3-830D-E7781CF26A7E.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/352b3e7f236aa8fa9e7b98cf386d76ec.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/35338672ce1762349818d4ba6dca31d4fe0d9dc8.ics" [2021-03-26T06:08:10.425Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/353DC5FC-A62D-4D23-9B16-09F74F9D3EC0.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/367c9b6f9902379ff6d36fb70a09762f4d9a8443.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/36A0A4C1-3D13-4960-B29C-994AC9C1291D.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/386557EB-D5E4-4CBA-B6B8-AAEE09311616.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3A3134AB-3B7C-4D52-B792-BACD057379CF.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3ABB12C6-E40B-4680-97E8-A8F2839D0C00.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3C476CD0-4356-4F28-920C-33478E066AE5.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3D24BA12-EFBD-402E-9001-157EB8B1D5FF.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3a73rpvka2l30pcqbcfnq44fgr%40google.com.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3a9f02478cdfb21c13df876b7706d11dfc11c01d.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3caietma7u28p761iml6fcup8i%40googlecom.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3f175fb795ce241d7f81218bde78414b150cfbd4.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/3f7rlevpgrjom7q7792ek2vc38%40googlecom.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/42A32F13-0AA0-4F5B-B2D2-3743C73A428C.ics" [2021-03-26T06:08:10.426Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/446D3D9A-85B8-40B8-A5D3-F0749CA27096.ics" [2021-03-26T06:08:10.427Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/46181028-2B63-4245-A1BB-8F4914628304.ics" [2021-03-26T06:08:10.427Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/4708AC57-E9F4-4322-AF4B-952FCA3E29F7.ics" [2021-03-26T06:08:10.427Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/47f1e4211ca5845155797d6a7c207aba7007f299.ics" [2021-03-26T06:08:10.427Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/4813b73b983c8cabd6d8e9b05b4cabbdf85b8e93.ics" [2021-03-26T06:08:10.427Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/4930F02E-A41D-4C92-A056-BF68EFA51CE8.ics" [2021-03-26T06:08:10.427Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/49CC8DE2-E5BF-41CC-997C-6434CB7A5135.ics" [2021-03-26T06:08:10.427Z] akonadi_davgroupware_resource org.kde.pim.davresource DavGroupwareResource::onMultigetFinished: Empty item returned. "https://caldav.icloud.com/<dsid>/calendars/<calendar_name>/49be24043ccb81821f88b625dea0a613a064e9e1.ics" I can randomly pick any of these results, paste it into a browser, and it will produce a fully functional, downloadable ics file once I provide credentials.
Meant to provide this in my last comment; [manjaro@manjaro Documents]$ pacman -Q plasma-desktop plasma-desktop 5.21.3-1 [manjaro@manjaro Documents]$ pacman -Q korganizer korganizer 20.12.3-1 [manjaro@manjaro Documents]$
So anyhoo, I have a couple of theories here; 1. The login prompt produced by iCloud is being sent for each and every .ics file, so as far as the davgroupware element is considered, it received a null ics file (as it lacked basic ics structure). 2. davgroupware is not able to read the ics files produced by iCloud, possibly due to a field present in the files themselves (this is unlikely).
It seems that KOrganizer is not sending the Authorization header when fetching. Please see: https://forum.kde.org/viewtopic.php?f=215&t=165265&p=448123#p448123
I fixed iCloud calendar sync problems in https://invent.kde.org/frameworks/kdav/-/merge_requests/16. I didn't find any problems with the auth headers as wabbajack reported, the issue was a malformed request.