[CR #418026] When you add a secondary Replication Monitoring Services (RMS) under a primary RMS, and the secondary RMS status is reported as SUSPECT, Replication Manager does not immediately report any information about this in the Reason column of the List view or in the Details pane of the suspect RMS.
Workaround:
In the Details pane, right-click the suspect RMS and select Properties. The reason for the SUSPECT state displays.
Wait for the duration of the Monitoring Interval and navigate out of and then back into the Details pane. The Reason column is now populated with information. The default Monitoring Interval is 60 seconds.