Thanks for the link. I checked that already and as I said, I can logon with the user.
I am a little bit confused now. You state that keycloak password can be found in /etc/ keycloak.secret*. I thought that is the password of user admin. In keycloak documentation for example it says: univention-keycloak --binduser=admin --bindpwdfile=/etc/keycloak.secret init.
In Post https://help.univention.com/t/updating-from-postgresql-11-to-postgresql-15/22162 is explained that the secret for user keycloak is in /etc/postgresql-keycloak.secret.
Which one is the correct one?