Activate LDAP group membership checking

Hi, I'm trying to activate the LDAP group membership checking in FreeRadius. In my radiusd.conf i've modified the group checking section: groupname_attribute = cn groupmembership_filter = "(|(&(objectClass=GroupOfNames)(member=%{Ldap-UserDn}))(&(objectClass=GroupOfUniqueNames)(uniquemember=%{Ldap-UserDn})))" groupmembership_attribute = ou By looking in my openldap logs, freeradius is not even trying to search for the group. Do i have to activate something else to enable group checking? Thank you