Distribution List Delegates Randomly Being Removed from list

Curtis Scholl (AZAD) 5 Reputation points
2023-02-13T13:03:41.8333333+00:00

Hello the group

I have a distribution list with 43 users. Of those 43 Users, 32 are Delegates. They are delegates that is until some get removed randomly. I have a hybrid Microsoft365/AzureAD with an onPrem Active Directory system. The distribution group was created in Microsoft365, not AZAD. The group exists in AZAD as a reflection of the O365 group.

As I add users as delegates it seems that a random number of users get removed a few hours later.

When a "send as" user gets randomly dropped from the delegates list, the delegate gets the error message "not authorized" and a bounceback email, and I have to add them once more to the delegates list. It is happening more and more frequently.

So I ask:

  1. Why are the "Send As" delegates randomly being removed from the Delegates list?
  2. Is there a limit to the number of delegates to a distribution list?
  3. Where is the main DB for the Exchange being held in the 0365 and why is the delegate list being overwritten after an hour or less.
  4. Can a delegates list contain a group rather than actual email addresses?

UPDATE:

I added 5 users this morning and saved the list. 9:00 AM.

They were in the list at 10:00 AM

They are gone again as of 12:00 AM.

Curtis Scholl

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  1. Curtis Scholl (AZAD) 5 Reputation points
    2023-02-23T22:57:49.3133333+00:00

    To whom it concerns:

    I have an empirical experience that suggests that the CLASSIC EAC is the main interface to our distribution lists.

    Evidence:

    Microsoft365 NEW Exchange Admin Center may not be the source of the issue, but it is the place where the issue manifests itself. Through pain and trial, I have isolated this admin center as part of the problem. When it is used to set delegates on the selected Distribution Group it deletes delegates when it reaches a certain number of delegates. I do not know that number. To me it is a random selection and removal. When I discover them missing, to add the users/delegate that were dropped will only make others get removed. I have seen this time after time.

    When the Microsoft365 Classic Exchange Admin Center is utilized, and delegates are added, the delegates stay in the list of delegates and are propagated through such that the Microsoft365 NEW Exchange Admin Center will see them. I just cannot and do not use that interface to modify the delegates.

    So I have questions:

    Why is the NEW Exchange Admin Center acting this way?

    Is the Classic EAC the true center of the Microsoft365 universe?

    Must all major changes need to go through that interface?

    I would like to understand this better.

    Curtis Scholl

    ******@kalittaair.com

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  3. Abey ElSayed 0 Reputation points
    2023-06-16T14:49:51.6133333+00:00

    Is there any update on this? since Classic EAC is no longer available?


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