We have an SBA xxx then gives an error 500 when we call to Exchange UM subscriber in hybrid Office 365/OnPrem deployment.
15000; reason="Unable to read the user properties publication for the user or contact object."; source="xxx"; appName="ExumRouting"
The solutuon/workaround is to re-create or move contact:
move-CsExUmContact -Identity sip:voicemailxxx@xxx -Target zzz
where ZZZ is hub frontend pool.