This is really great question! Internally we also are doing tests to check how both products (Veeam Backup & Replication and Veeam MP) coexist together. And for your question there is an answer.
- First of all it should work better if you just create a group based on replica suffix "_replica". Use something like "( Object is VMware Virtual Machine AND ( Display Name Contains _replica ) AND True )" as a membership formula.
- Secondly - wait an hour or so for your group to populate, SCOM is quite slow with group membership discovery (for a reason)
- Create an override for the rule "Veeam VMware: Virtual Machine Error" for group of replicas. In the Exclude Events parameter, instead of "Dummy.Event.Id.3|Dummy.Event.Id.4" add "VmMacConflictEvent".
This should disable this event for VBR replicas.
Let me know if you have any other questions. And we would highly appreciate any other feedback about using both MP and VBR together.
Thank you very much for your question.