Openstack Keystone groups not synced to ManageIQ

[Nirshal]

Hello everyone,
we are writing from Sourcesense, a system integrator in Italy that is part of the Poste Italiane group.
For one customer in the telecom sector we are working on a cloud infrastructure that is based on ManageIQ and Openstack.
In our use case we would like to provision for the Tenant/Project and user groups directly on openstack, and see them synched on ManageIQ using the manageiq-providers-openstack.
In our understanding, this is managed by the file app/models/manageiq/providers/openstack/identity_sync_mixin.rband in particular by methods like def sync_users(admin_role_id, member_role_id, password_digest), def create_or_find_miq_group_and_add_user(user, tenant, role_name).
Unfortunately, our testing resulting in the groups not syncing, while this correctly happens for the tenants created on openstack.

We do not undestand if we misconfigured something in the interaction between Openstack and ManageIQ or if we misinterpreted the code in the manageiq-providers-openstack plugin, and the group sync is not meant to happen at all.

Can anyone provide help on this?