This error usually indicates that there is an issue with the VM XML configuration during the restore process. It might be caused by missing elements, version incompatibility, or corrupted backup metadata.
I’d recommend checking whether the backup was taken from the same RHV version, and also verifying the VM template, storage domain status, and cluster compatibility level. Reviewing the engine logs (/var/log/ovirt-engine/engine.log) may provide more detailed clues.
Hope this helps — let us know what you find in the logs!