https://docs.redhat.com/en/documentation/red_hat_openstack_services_on_openshift/18.0/html/deploying_red_hat_openstack_services_on_openshift/assembly_creating-the-control-plane#proc_creating-the-control-plane_controlplane

(Also https://docs.redhat.com/en/documentation/red_hat_openstack_services_on_openshift/18.0/html/deploying_red_hat_openstack_services_on_openshift/assembly_creating-the-control-plane#ref_example-OpenStackControlPlane-CR_controlplane )

Procedure, step 4, OVN:

Missing the `ovnController.networkAttachment` parameter.

  ovn:
    enabled: true
    template:
      ovnController:
        networkAttachment: "tenant"

Originally discussed in Slack at https://redhat-internal.slack.com/archives/CQXJFGMK6/p1728505886869899 where Yatin suggests that `networkAttachment` must always be defined.