Unable to use ovirt plugin as source inventory

Hello,
I’m testing Oracle Linux Automation platform, that is based on awx 15.0.1 and ansible 2.9.27 on an rpm install, without containers.
I have created a credential of type “Red Hat Virtualization” and I’m now trying to configure an inventory with a source of type “Red Hat Virtualization”.
When running the source sync in debug mode I get an error about unknown plugin.
Do you know how can I fix it or what to check?

The message I get:

Using /etc/ansible/ansible.cfg as config file
setting up inventory plugins
[WARNING]: * Failed to parse /tmp/awx_80_x02dpocf/ovirt.yml with auto plugin:
inventory config ‘/tmp/awx_80_x02dpocf/ovirt.yml’ specifies unknown plugin
‘ovirt.ovirt.ovirt’
File “/usr/lib/python3.6/site-packages/ansible/inventory/manager.py”, line 280, in parse_source
plugin.parse(self._inventory, self._loader, source, cache=cache)
File “/usr/lib/python3.6/site-packages/ansible/plugins/inventory/auto.py”, line 53, in parse
raise AnsibleParserError(“inventory config ‘{0}’ specifies unknown plugin ‘{1}’”.format(path, plugin_name))
[WARNING]: Unable to parse /tmp/awx_80_x02dpocf/ovirt.yml as an inventory
source

the temporary ovirt.yml file under /tmp/awx_80_x02dpocf contains:

plugin: ovirt.ovirt.ovirt

Thanks in advance,
Gianluca