Office 365 Dynamic distribution groups and on prem AD accounts

Copper Contributor



I have created a dynamic dist grp in exchange online.

We also have a previous on prem AD with sync on.

Its a hybrid solution.


Apparently some users doesn't receive the mail i send to the DDG.

I can see the the users not receiving email was created in the on prem AD years ago.


what have i missed?




1 Reply

Where are their mailboxes located? Have you confirmed they are returned as actual members of the DDG? Have you run a message trace and what does it show?