I finally thought that I found the right configuration for the Directory Connector syncing users from my Samba AD as it showed my a successful test and after starting the sync a successful sync. But unfortunately no invitations have been send out and no additional users show up in /admin/user/overview.
the log only show two lines for the sync attempt:
Aug 25 20:36:32 vault vaultwarden: [2021-08-25 20:36:32.014][request][INFO] POST /api/organizations/UUID_OF_ORGANIZATION/import Aug 25 20:36:32 vault vaultwarden: [2021-08-25 20:36:32.024][response][INFO] POST /api/organizations/<org_id>/import (import) => 200 OK
this is running vaultwarden in a FreeBSD jail (12.2p10) version 1.22.2 and Directory Connector 2.9.2
any help/idea would be great