have the following self test screen for a single domain no other backup swervers etc.
section from the auth log file 
/var/log/auth.log
2026-04-21T12:56:12.279232+08:00 dc01 sshd[4387]: pam_krb5(sshd:auth): user dc01$ authenticated as dc01$@ORG.xxxxxxxxxxCOM
2026-04-21T12:56:12.279681+08:00 dc01 sshd[4387]: pam_access(sshd:account): unrecognized option [maxent=0x400001]
2026-04-21T12:56:12.291997+08:00 dc01 unix_chkpwd[4388]: could not obtain user info (dc01$)
2026-04-21T12:56:12.292440+08:00 dc01 sshd[4383]: error: PAM: User account has expired for dc01$ from 10.10.0.5
