Guest AAD User with Same Domain Name

%3CLINGO-SUB%20id%3D%22lingo-sub-1193849%22%20slang%3D%22en-US%22%3EGuest%20AAD%20User%20with%20Same%20Domain%20Name%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1193849%22%20slang%3D%22en-US%22%3E%3CP%3ELooking%20through%20the%20Guest%20users%20in%20our%20AAD%20(%40contoso.com)%20I%20see%26nbsp%3Bone%20Guest%20user%20called%20%3CA%20href%3D%22mailto%3Atom%40contoso.com%22%20target%3D%22_blank%22%20rel%3D%22nofollow%20noopener%20noreferrer%22%3Etom%40contoso.com%3C%2FA%3E%26nbsp%3B%20-%20%22External%20Azure%20Active%20Directory%22.%20How%20is%26nbsp%3Bit%20possible%20that%26nbsp%3Ba%20Guest%20has%20the%20same%20domain%20name%20as%20the%20AAD%20itself%3F%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E
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Looking through the Guest users in our AAD (@contoso.com) I see one Guest user called tom@contoso.com  - "External Azure Active Directory". How is it possible that a Guest has the same domain name as the AAD itself?

 

 

 

 

 

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