SRM 5.8 with storage array replication VNX mirrorview.
Run a recovery and once completed run reprotect.
During the reprotect the storage synchronization gets stuck at 90%.
No real information from SRM on the status or errors so had to do some digging.
On the storage array reviewed the replicated LUN for the specific recovery plan and found that the the secondary image was showing "waiting for administrator to start synchronization".
By default SRM queries an ongoing synchronization every 30 seconds to report status so after selecting synchronization and its completion did the SRM status also update and completed.
This setting is adjustable in the SRM advanced settings per site: storage.querySyncStatusPollingInterval.