When configured in an Exchange Hybrid configuration, Dynamic Distribution Groups are not synchronized by DirSync.  For cloud users to see these objects in their GAL, a contact object must be created in the cloud with the SMTP address of the on-premises Dynamic Distribution Group.


This script creates the necessary contact objects in the cloud and restricts them to authenticated users.

 

Additional information on this script is available at:  Office 365 - Dynamic Distribution Groups in Exchange Hybrid