Massive Problem with 2023.2.3

Hello there,
I might say: "Houston we have problem". I had the problem that I could not change credentials in the scan config. Message: Credentials are not valid.
Ok. Tried a clean installation. Now I can't login to configure the system. Log says "The given user in the given domain could not be authenticated.
Please make sure that user name, password and domain are correct.". But I am logged on to this domain with this user.

So now what?