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