Expanding recipient 365 group in Outlook fills in account not part of group

Occasional Contributor

Writing a mail in Outlook (desktop client) to a Microsoft 365 group and expanding that group results in all the members of that group beeing recipients. BUT there is also an additional account added that is not a member of that group. Mail beeing sent to this group without expanding it will not be sent to this additional account.


Doing a similar thing in mobile outlook: Open properties of the group -> Show all members. The additional acount is listed.


Looking in the Admin gui the additional account is not listed.


Expanding the group in web outlook does not show the additional account.


Can anyone explain this?


Is there anyway to clear the account cache of mobile outlook, as I expect this to be some kind of caching problem?

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