Might be some issue with the synchronization on the backend. In any case, run the Get-Recipient cmdlet against said address, to see what kind of object remains. Get-Mailuser will also work, but it's narrower in scope.
Deleted Guest Mail User still showing up in the GAL

T. Kujala
8,761
Reputation points
Hi everyone,
I have deleted the specific guest mail user from the Azure Portal about one year ago.
This is still showing in Global address lists every users in our environment. It doesn't matter if you use an Outlook app or browser.
How can i find where it's coming?
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Exchange Online
A Microsoft email and calendaring hosted service.
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Outlook | Windows | Classic Outlook for Windows | For business
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Accepted answer
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Vasil Michev 119.5K Reputation points MVP Volunteer Moderator
2022-04-26T09:55:15.727+00:00