Comment 2 for bug 2048209

I've removed the role assignments, here's the trace of the failed rerun:

TASK [openstack.osa.service_setup : Add service users to roles] ******************************************************************************************************************************************************************
task path: /etc/ansible/ansible_collections/openstack/osa/roles/service_setup/tasks/setup_roles.yml:32
container_name: "cont01_utility_container-94aa78da"
physical_host: "cont01"
Container confirmed
Container type "lxc"
The full traceback is:
  File "/tmp/ansible_openstack.cloud.role_assignment_payload_142909u1/ansible_openstack.cloud.role_assignment_payload.zip/ansible_collections/openstack/cloud/plugins/module_utils/openstack.py", line 415, in __call__
    results = self.run()
  File "/tmp/ansible_openstack.cloud.role_assignment_payload_142909u1/ansible_openstack.cloud.role_assignment_payload.zip/ansible_collections/openstack/cloud/plugins/modules/role_assignment.py", line 179, in run
  File "/openstack/venvs/utility-27.3.0/lib/python3.8/site-packages/openstack/cloud/_identity.py", line 1238, in grant_role
    data = self._get_grant_revoke_params(
  File "/openstack/venvs/utility-27.3.0/lib/python3.8/site-packages/openstack/cloud/_identity.py", line 1199, in _get_grant_revoke_params
    raise exc.OpenStackCloudException(
failed: [cont01_magnum_container-07246985 -> cont01_utility_container-94aa78da(192.168.233.89)] (item=admin) => {
    "ansible_loop_var": "role",
    "attempts": 5,
    "changed": false,
    "extra_data": {
        "data": null,
        "details": "None",
        "response": "None"
    },
    "invocation": {
        "module_args": {
            "api_timeout": null,
            "auth": null,
            "auth_type": null,
            "ca_cert": null,
            "client_cert": null,
            "client_key": null,
            "domain": "magnum",
            "endpoint_type": "admin",
            "group": null,
            "interface": "admin",
            "project": "",
            "region_name": null,
            "role": "admin",
            "sdk_log_level": "INFO",
            "sdk_log_path": null,
            "state": "present",
            "system": null,
            "timeout": 180,
            "user": "trustee_domain_admin",
            "validate_certs": true,
            "wait": true
        }
    },
    "msg": "Must specify either a user or a group",
    "role": "admin"
}