Hi,
Is the dynamic distribution group migrated from a lower version of Exchange to a new version of Exchange?
Please run the following command to check this problematic dynamic distribution group:
Get-DynamicDistributionGroup -Identity <> | fl *version*,*filter*
If the Exchange version is not 0.10 (14.0.100.0), please try to re-create a new dynamic distribution group and see if the issue is resolved.
For more information: Create a dynamic distribution group
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