As you may be aware Password Manager ADLDS currently only allows the use a specific ADLDS object type &(objectClass=user)(objectCategory=person).
This is by design. An enhancement request (TF00642576) has been created detailing the feature: Allow PM for ADLDS use different AD object types, not only &(objectClass=user)(objectCategory=person).
The product team will evaluate the request and this feature may become available on a future release of the product.
Please refer to this article for updates or contact support referencing the Enhancement Request ID: TF00642576.