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Retain the same email address value across two objects in Azure AD (Guest and Local)
Howdy Techies! This might sound stupid but thought to throw it here anyway to see if anyone managed to work around this in any possible alternative ways. I have a very specific need to retai...
Same email address (proxyAddress) for both a Guest account and a local account in Azure AD/Entra ID is not allowed. It will enforce the uniqueness of proxy addresses across all directory objects, which means any attempt to duplicate them will result in conflicts. You may consolidate to access under a single identity or, where separation is required, adjust the UPN or email alias of the Guest account to ensure uniqueness.
https://learn.microsoft.com/en-us/answers/questions/1246855/how-to-have-a-guest-user-and-hybrid-user-with-same