Mint 21.1 cannot login after domain join

Hi UCS community,

I had some issues when I tried to integrate my Linux Mint 21.1 Client to my UCS server (5.0-5 errata838), first the univention-domain-join complained about one missing ldap.conf file, after installing libldap-common the domain-join was successful, I could also find my Linux Mint client in the UMC module ->Computer.
However, when I tried to login as one UCS user on the Linux Mint Client, it constantly said the password is incorrect even with Administrator account. I have downloaded several additional dependencies like python3-trio python3-sniffio libsasl2-modules-ldap, but the problem has not been solved. Does someone have an idea?

Here is a copy from /var/log/auth.log
Oct 13 14:46:58 locutus lightdm: pam_succeed_if(lightdm:auth): requirement “user ingroup nopasswdlogin” not met by user “erik”
Oct 13 14:47:01 locutus lightdm: pam_unix(lightdm:auth): check pass; user unknown
Oct 13 14:47:01 locutus lightdm: pam_unix(lightdm:auth): authentication failure; logname= uid=0 euid=0 tty=:0 ruser= rhost=
Oct 13 14:47:01 locutus lightdm: pam_sss(lightdm:auth): authentication success; logname= uid=0 euid=0 tty=:0 ruser= rhost= user=erik
Oct 13 14:47:01 locutus lightdm: gkr-pam: error looking up user information
Oct 13 14:47:01 locutus lightdm: pam_unix(lightdm:account): could not identify user (from getpwnam(erik))
Oct 13 14:47:01 locutus lightdm: ldapdb_canonuser_plug_init() failed in sasl_canonuser_add_plugin(): invalid parameter supplied
Oct 13 14:47:01 locutus lightdm: _sasl_plugin_load failed on sasl_canonuser_init for plugin: ldapdb

I would be very grateful for some suggestions.
Thank you,
erik.

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