Group Metrics generation fails to complete in multidomain environment

Symptoms

The Group Metrics generation process doesn't finish on a Microsoft Exchange Server 2019 server. Some distribution lists (DLs) don't update the msExchGroupMemberCount and msExchGroupExternalMemberCount attributes.

Resolution 

To fix this issue, install the following cumulative update: 

• Cumulative Update 15 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019