On-premises security groups are not synced to Exchange Online in a hybrid deployment
Original KB number: 2988761
Symptoms
In your hybrid deployment of on-premises Exchange Server and Exchange Online in Microsoft 365, you notice that some on-premises security groups are not synced to Exchange Online.
Cause
This issue occurs if the on-premises security groups are not mail-enabled. In a hybrid deployment, only security groups that are mail-enabled are synced to Exchange Online. This behavior is by design.
More information
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