https://bugs.winehq.org/show_bug.cgi?id=48983
--- Comment #3 from Zebediah Figura z.figura12@gmail.com --- (In reply to momarz from comment #2)
what do you mean exactly with "clean WINEPREFIX"?
For an explanation of prefixes see: https://wiki.winehq.org/FAQ#Wineprefixes
I.e. try setting the environment variable WINEPREFIX to a nonexistent directory and reinstalling the software.
can you confirm this error on your machine?
Using Wine 5.6, when entering a fake username and password I get "Sie haben einen falschen Benutzenamen oder ein falsches Passwort eingegeben", which seems to imply that no, but maybe it's necessary to enter real credentials to trigger the error?
In any case I don't see the terminal messages pasted.