Single Sign on created users. Shouldn't it create users with my mailbox domain?

Jody McLaughlin 1 Reputation point

Starting a new setup this weekend and I have never used single sign on. After researching I figured I was good to go.

My first users should of been johndoe@jaswant .com instead it created I did already have the first 5 users in Microsoft 365 before attempting single sign on. I was hoping it would sync the current users instead of a duplicate username but different domain.



Azure Active Directory
Azure Active Directory
An Azure enterprise identity service that provides single sign-on and multi-factor authentication.
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  1. Givary-MSFT 14,796 Reputation points Microsoft Employee

    @Jody McLaughlin

    Apologies for the delay in answering this query. As I understand your issue is users are synced as instead johndoe@jaswant .com.

    When you synchronize your on-premises directory with Microsoft 365, you have to have a verified domain in Azure Active Directory (Azure AD). Only the User Principal Names (UPNs) that are associated with the on-premises Active Directory Domain Services (AD DS) domain are synchronized. However, any UPN that contains a non-routable domain, will be synchronized to an domain.

    Would like to understand did you verify your domain in Azure AD/O365 ?

    Refer to this article about the steps how to verify the domain -


    Let me know if you have any questions.

    Please remember to "Accept Answer" if answer helped, so that others in the community facing similar issues can easily find the solution.

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