Duplicated users in Azure AD

Question

I've set up Azure AD Connect on my server and synced users to Azure AD.

Now I have several users which are duplicated - for example

Name: John Doe
User principal name: [e-mail]
Directory synced: No

Name: John Doe
User principal name: [e-mail]
Directory synced: Yes

It seams like the latter is synced but with wrong "user principal name".

Question 1: Can I just delete both accounts and let it sync again?

Question 2: If I delete a user in Azure AD, will it delete the user in Office 365 and all their mails?

Answer 1

You can visit How to: Fix OnMicrosoft E-mail Address for Azure AD Sync Connected Users in Office365

Here, the same issue is discussed. You might have to Manually force Azure AD Connect to run a full sync cycle. You can do this in two ways:

• Using PowerShell - https://community.spiceworks.com/how_to/140656-manually-force-sync-azure-ad-connect-using-powershell

• GUI - https://community.spiceworks.com/how_to/140653-force-manual-azure-ad-connect-sync

Answer 2

When UserPrincipalName (UPN)/Alternate Login ID suffix is not verified with the Azure AD Tenant, then Azure Active Directory replaces the UPN suffixes with the default domain name "onmicrosoft.com".

When you create a user [e-mail] it will only have same UPN if the domain is verified in Azure AD which can be done by following. Login to Azure > Azure AD > Customer domain name > add custom domain and make it primary. The custom domain MX record needs to be verified.