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Hello,
I have a user that when I query it by id using the Microsoft Graph Get directoryObject API his UPN contains #EXT# and ends with onmicrosoft.com
But when I look at the profile of the same user (same object id) in our AD, his UPN looks completely different. No #EXT# and different domain.
I don't understand why the same user has different UPN when I query it from Microsoft Graph than what actually appears in the AD.
Why does the user's UPN changes depending on from where I look at him? What is his "real" UPN?
Those are Guest users, by definition they should be "external" to your AD. Moreover, UPN is not the value that "links" on-premises and cloud objects, that role is played by the sourceanchor (objectGUID by default).
Thank you for your answer. The user is indeed a guest user. But I still don't understand why in the AD of my tenant (and when I receive his sign-in logs) I see his "real" UPN instead of the UPN that contains #EXT#
If I'm to take a wild guess, someone provisioned a (mail) user account for this person. It's normal that you only see the "real" UPN in logs, in fact the whole user_domain.com#EXT#@tenant .onmicrosoft.com identifier is more of a "pointer" and is not used to actually log in. Instead, the user logs in with their "real" UPN against their own Azure AD instance, which in this case will be user@keyman .com.
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User Type is also "Member"in my case, not Guest. Bit confusing