Changes are not synced by the Azure Active Directory Connect tool, after you changed the UPN of the user account in On-Premise DC.

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Work-Around this problem.

On a client computer that has the Azure Active Directory Module for Windows PowerShell installed, follow these steps:

  1. Click Start, point to All Programs, click Windows Azure Active Directory, right-click Windows Azure Active Directory Module for Windows PowerShell, and then click Run as administrator.
  1. Run the following commands, pressing Enter after each command:

Connect-MSOLService

Note When you’re prompted, enter non-federated cloud service global administrator credentials.

Set-MsolUserPrincipalName -UserPrincipalName farook.ismail@mifarook.co.in -NewUserPrincipalName farook@mifarook.co.in

Note In this command, [farook.ismail@mifarook.co.in] represents the current UPN of the user ID, and [farook@mifarook.co.in] represents the UPN of the user ID that has the domain suffix.