SUMMARY STEPS TO REPRODUCE 1. Add T-Online carddav with https://spica.t-online.de/spica-contacts/carddav as adress 2. Add a Contact in Webspace 3. Let it automatical sync OBSERVED RESULT Kaddressbook doesnt fetch Contacts, but upload new Contacts EXPECTED RESULT Kaddressbook fetch Contacts and upload Contacts SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora 33 (available in About System) KDE Plasma Version: 5.20.5 KDE Frameworks Version: 5.78.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION
Created attachment 134676 [details] Log Here is the Log
Created attachment 134677 [details] And here the Debug And here is the Debug from Akonadi-Console
The same issue can i reproduce with KDE neon
Can confirm this bug still persists in KAddressbook 6.4.2 on the latest openSUSE Tumbleweed. For some reason, with my Nextcloud CardDAV, it will sync the default Accounts address book, but any other address books will not show anything. This warning in the Akonadi logs seems suspicious, although I'm not sure if it's related to the cause: 2025-06-23T12:41:13 [WARN ] org.kde.pim.akonadiserver: Handler exception when handling command FetchCollections on connection akonadi_davgroupware_resource_1 (0x563e5eee0aa0) : Hierarchical RID does not specify an existing collection I can confirm it's not an issue with my server's CardDAV implementation, as it syncs fine using DAVx5 on my Android phone, and on some other devices too.
Similar thing happens with caldav. Looks like akonadi got a lot of new bugs. ;)