Ultrasound has detected that a replica set has been deleted, but Active Directory indicates the replica set still exists. This could be an Active Directory replication issue. This alert might be caused when Ultrasound is not correctly receiving data from the reference domain controller.
If you recently deleted a replica set, wait and see if the problem disappears in a few hours. If so, you can ignore this alert. If the replica set was not deleted, use FRSDiag and the FRS Troubleshooter to determine the problem. If you have failed Active Directory updates, this is probably because Ultrasound cannot get updated information from Active Directory. Therefore Ultrasound is working on stale data. If you don’t have failed Active Directory updates, then it’s probably an Active Directory replication issue.