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AD synchronization issue?

Perhaps the AD group is actually a Distribution List group? I've had my AD team do that to me over the years a few times.

Yea looks to be some AD Issue.. Can you let me know what may be cause from AD end

Is synchronization completing to all DCs? When you change an AD group membership, that change needs to be replicated to all DCs. Check the synchronization status

Ok James, will check the replication Part