Openshift_adm_groups_sync does not sync users from ldap groups

I would like to sync groups of users from ldap to openshift. I tried openshift_adm_groups_sync module which creates empty groups (without users). Does anyone use this modul, because I cant find the issue? I use the same group-sync.yaml file for years and it works fine. But with openshift_adm_groups_sync users from ldap groups are not synced. Only empty groups are created so the issue is not with the ldap access.