I can't sign in as regular user, only as root

Hello,

yesterday I added some packages in software like Red Hat Ansible Engine, Extra Packages for RHEL 8, Satellite, Developer Tools, CodeReady Linux Builder, ...
Afterwards I got shown several issues during DNF Update.
Meanwhile, I can't sign in to my local user account. Then I tried it with "Not listed" at username. I entered root and the password to it. Finally, I got sign in.
How can I fix the other user account?
I added another user account, removed the software packages I added hours before. NOW, I have access with a standard user, but not my regular account, I usually use.
How to change it?
That's the messge when I use sudo dnf update:

dnf update
Updating Subscription Management repositories.
/usr/lib/python3.6/site-packages/dateutil/parser/_parser.py:70: UnicodeWarning: decode() called on unicode string, see https://bugzilla.redhat.com/show_bug.cgi?id=1693751
instream = instream.decode()

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