LDAP group filter not working

CMK version: Enterprise Edition 2.1.0p26
OS version: Ubuntu 22.04.2 LTS

Hi, we have problems with connecting checkmk to an OpenLDAP and filter users based on group memberships
The user in LDAP doesn’t have the memberof attribute.
We tried to use the option “Filter group”, but checkmk get no users back from the LDAP.

In the logs on the OpenLDAP server we see, that checkmk gets all DNs from all users in the specific filter group and builds a searchstring
with this DNs like

(&(objectClass=Person)(|(distinguishedName=uid=abc123,ou=foo,ou=bar)(distinguishedName=uid=yxz456,ou=foo,ou=bar) … )

Problem is, there ist no attribute distinguishedName in OpenLDAP

any Ideas if this is a bug or if something is worong with our openLDAP config?

regards
juergen

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