Created attachment 187736 [details]
Akonadi_ews agent messages

SUMMARY
On fresh install of Fedora 43 I cannot create EWS account that uses OAuth auth scheme for my work.
I can open configuration window, put correct data, login to MS auth service, but no config files are saved, no account is visible in akoandiconsole

STEPS TO REPRODUCE
1.  Open 'Account configuration' via KMail configuration or Akonadiconsole, select Microsoft Exchange Server (EWS) 
2. Fill 'account name' and 'E-mail' fields with correct data
3. Select OAuth2 (Office365) as authentication method and click 'Try to connect' button
4. Login to MS account (here used username/pass and sms message steps).

OBSERVED RESULT
Once auth code from SMS is provided, connection window quickly flashes, then both auth window and account configuration windows close. No account is created, no account files appear in ~/.config/ and ~/.config/akonadi, however agents count in ~/.config/akonadi/agentsrc file is bumped.

EXPECTED RESULT
Once account configguration is closed, account is created and visible both in akonadiconsole and kmail settings. in KMail there should be visible EWS mails folder.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.21.0
KDE Applications 25.12.0
Qt Version: 6.10.1
Kernel Version: 6.17.11-300.fc43.x86_64 (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
If I copy akoandi_ews agent config files from my old laptop (also Fedora 43 upgraded from past releases) and add it to agentsrc files, account is visible with correct data, but it fails to authenticate. Attempt to connect and reset authentication data has no effect. ie I can login to MS site, but no auth data are saved and akonadi is unable to retrieve folder subscriptions.

I attach akonadi related from system log (from the moment akonadi server was started to the last entry about ews account) and messages captured in akonadiconsole.