2,243 questions
Guest users cannot be created with custom domain as they are in a verified domain of your tenant.
About the default user principal name for guest users
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yamatsum
26
Reputation points
Is it possible to set the guest user's principal to the custom domain when creating the guest user?
The specified custom domain is set to primary
Accepted answer
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Manu Philip 18,151 Reputation points MVP2020-10-17T12:04:12.837+00:00