Why is my secondary UMP not synchronized with primary?
In the use case, the secondary UMP was showing some QoS data but no Alarms.
This is general information applicable to most versions of UIM.
A multi-UMP setup requires for servers to be in the same broadcast network for synchronization to occur.
A traceroute from either server to the other should show only one hop between the two devices.
Please note that mulit-UMP setups were not designed for, or should replace, High Availability solution.