Hi Stefan,
I tried something else, I deleted my 28 character user and had a shorter one created.
Now I can log into the system even though it doesn't ask for MFA, which is quite strange. I think it's useful to implement it so you don't have to enter it later every time.
It would also be appropriate to point out that if you create a user with more than 25 characters he will not be able to log into the system.
Thanks for help