Ah, so … the video doesn’t correlate with the diagnostic. Could you do this:
Attempt to log in as the user that doesn’t work
Wait 1 minute
Ctrl+Alt+F2 and run eos-diagnostics
Attach that here
Just so I can be sure I’m looking at the right section of the log.
Please could you also attach the files from /var/lib/AccountsService/users/? If you have a password hint configured, it is stored there, so you might want to replace it with “REMOVED” or something.
I think you said on Telegram that you’ve tried moving $HOME/.config/dconf/user aside in the account that doesn’t work – please can you confirm that I’m not misremembering?
You could also try this:
Ctrl+Alt+F2, log in as the broken user
Move all your configuration files aside:
mkdir ~/config-backup
mv -t ~/config-backup ~/.[^.]*
The last argument there means "all files and directories in home (~) beginning with a . and followed by any character other than a dot ([^.]) followed by 0 or more other characters (*)
Log out from the text console
Ctrl+Alt+F1, try to log in
If this works, move config files and directories back one by one to see which one caused problems.