LDAP error not valid email address in dns entry

I’m having this error and can’t login to windows servers using AD

08.04.2025 12:30:27.940 LDAP        (ERROR  ): InvalidSyntax: Invalid syntax: Contact person: Not a valid email address! The email address is not valid. It must have exactly one @-sign. ('zoneName=ccm.local,cn=dns,dc=ccm,dc=local')

Because that error not i also have issues in reject list

Found 0 UCS rejects and 1 S4 rejects. See Univention Support Database - How to deal with s4-connector rejects for more information.
S4 rejected:
S4 DN: DC=@,DC=ccm.local,CN=MicrosoftDNS,DC=DomainDnsZones,DC=ccm,DC=local, UCS DN: not found

Anyone can help