SUMMARY
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***


STEPS TO REPRODUCE
1. Go to "Online Accounts" in "System Settings"
2. Click on "OpenDesktop" or "Google" (the other two cloud service buttons show at least a login window)
3. Nothing happens, after few seconds the process "signon-ui" takes ~8% CPU load until killed/terminated

OBSERVED RESULT
1. See "STEPS TO REPRODUCE".
2. Don't know whether it's still the case, but some time ago (2-4 years) a login form for Google appeared, but Google never accepted any login because of "your browser is insecure, try login with some other web browser" (or so) - which made the whole function unfortunately useless...
3. After that (I assume because of / after killing the named process that causes the strong CPU overhead), on top of the "Online Accounts" category in systemsettings there is an error shown:
"There was an error while trying to process the request: userActionFinished error: 2"

EXPECTED RESULT
1. "Any reaction", i.e. login-windows showing up like when clicking on NextCloud or OwnCloud (I have none of two atm)
2. Successful login (f.e. into Google or any other platform one can choose there) if E-Mail/Username and Password are both valid. Maybe some workaround like implementing the login into Google from some external web browser (Firefox, Konqueror, Chromium or if Google allows it. via some CLI tool like some programs (f.e. many simple CLI tools for popular apps and sites, f.e. PasteBin.com, Telegram-CLI, etc. already provide similar solutions)

SOFTWARE/OS VERSIONS
Linux Distro: Debian GNU/Linux trixie/sid (actually "testing", not "sid"(?)) x86_64
KDE Plasma: 5.27.8
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.10

ADDITIONAL INFORMATION
Thank you for KDE! Thank you very much for your work! :)
Greetings from Germany!