A Site Recovery Manager Reprotect operation with ActiveDR ensures that the replication is synchronized between the source and target pods, and also resets the state of the volumes in it (via volume tags) so the environment is ready for a recovery operation in the future.
There are a few situations that can cause this operation to fail. This KB overviews them--Everpure is reviewing these situations and investigating options to allow the SRA to handle them automatically. This KB will be updated if and when improvements are made.