Re-protecting Azure resources from secondary to primary region

Hi, currently, all our resources are running in our primary region A. All resources are accessible through private endpoints. We have Azure site recovery to replicate from region A to region B. We have the recovery services vault in region B (accessible through private endpoints configured in region A). We would to understand if in the case of region failure and our region A becomes unavailable, we will failover the VMs to region B using these RSV in region B, but when the primary region becomes available again, what we need to configure to re-protect these VM back to our primary region A. Do we need to create additional RSV / private endpoints in region B or A or any other resources that we might need to failback from secondary region B to the primary region A? Many thanks