Comment 4 for bug 1911788

Thank you for providing more information, as you can see on the port details you are having exactly the same issue:
| binding_host_id | juju-37c2ba-2-lxd-16

The binding_host_id should have been set to the FQDN of the octavia unit, but as explained on the referenced bug that is not happening due to the container not being able to establish its FQDN at initial deploy or subsequent reboots.

I will mark this bug as a duplicate of the referenced bug.