Apache Directory all users CAN login

All users in my LDAP Directory (Apache) can login, but only one account should be able to, what has to be done to fix this?

User LDAP Query:
(&(objectClass=person)) # Result: will find all users, as expected

Login Attributes:

(&(objectclass=groupofnames)(|(cn=Nextcloud)(cn=dokuwiki))) # Result: finds two groups, as expected

My nextcloud group’s attributes look like:
objectClass: groupofnames (structural)
objectClass: top (abstract)
cn: Nextcloud
member: cn=nxtcld,ou=people,dc=example,dc=com