Dynamic Distribution Groups (DDGs) can not be expanded in any Windows based client not even on the Web Outlook.

Question

Dynamic Distribution Groups (DDGs) can not be expanded in any Windows based client not even on the Web Outlook.

Fogt, Anita 20

Hi,

In some article I found states that Web or the New Outlook client should be able to handle such request but after several test we realized this is generally unavailable.

When this option be available again?

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SokiGuo-MSFT 31,461 Reputation points Microsoft External Staff

2025-03-27T01:53:10.14+00:00

Hi @Fogt, Anita

Haven't received your message for a long time. I am checking the status of this case. Please let us know if you would like further assistance. Meanwhile, if the reply is helpful to you, please try to mark it as an answer, it will help others who encounter the same issue and read this thread. Thank you for your understanding and patience!

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SokiGuo-MSFT 31,461 Reputation points Microsoft External Staff

2025-03-27T01:53:10.14+00:00

Hi @Fogt, Anita

Haven't received your message for a long time. I am checking the status of this case. Please let us know if you would like further assistance. Meanwhile, if the reply is helpful to you, please try to mark it as an answer, it will help others who encounter the same issue and read this thread. Thank you for your understanding and patience!

Answer 1

Vasil Michev 116.8K MVP

That's the expected behavior. Dynamic DGs do not have a pre-set membership list, instead their membership is calculated each time a message addressed to the DDG is processed. Hence, there is no way for Outlook to "expand" the membership.

Microsoft did introduce a "membership" concept for DDGs a while back, which works as a snapshot of sorts, but it still does not allow email clients to expand DDG membership.

Fogt, Anita 20 Reputation points

2025-03-21T08:53:08.02+00:00

Interesting, Outlook for Mac can do the job (using Exchange Online API).

So the actual question here when will the new Outlook client be able to use Exchange Online API?
SokiGuo-MSFT 31,461 Reputation points Microsoft External Staff

2025-03-25T09:36:02.7066667+00:00

Hi @Fogt, Anita,

Thanks for your reply!

The New Outlook design is not complete at the moment, if you have any suggestions or ideas, I suggest you post them here. Hopefully, Microsoft will take notice of this in the future. Thank you for your understanding and support!

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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ChristyZhang-MSFT 26,056 Reputation points Microsoft External Staff

2025-03-28T07:59:23.1666667+00:00

Hi @Fogt, Anita

Just checking in to see if above information was helpful. If it is useful, would you mind marking the helpful post as an answer? Which would benefit others who also has similar issues in forum.

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Dynamic Distribution Groups (DDGs) can not be expanded in any Windows based client not even on the Web Outlook.

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