Signin iCloud App for Windows not working
Initial situation:
Windows 10 Professional PC with iCloud app from Microsoft Store installed.
Signing in with the Apple ID does not work and an error message "An unknown error has occurred" appears. If one tries the login again 30 seconds later, then it seems to work (query 2nd factor). Again a short time later the app seems to be logged out again. Trying again fails with the same error. So it goes always in alternation.
The amazing thing: Another user on the same computer has no problems.
Here in the community I have not found anything yet.
Many greetings