To Reproduce Steps to reproduce the behavior:

1. Deploy an openstack cluster with multiple cinder backends and each with a different 'volume_backend_name'
2. Create an audit with the zone migration strategy to migrate a volume from a pool in one backend to a pool in another backend

Expected behavior

• The volume is migrated to the destination pool. Instead

Bug impact

• Any volume migration in a cluster with the storage setup described will fail.

Known workaround

• Configure volume types with a volume_backend_name, and all cinder backends that the user wants to migrate volumes between with the same volume_backend_name