Changing User Principal Names (UPN) with Azure Active Directory Sync Tool (DirSync)

In this post I want to document the process to make changes to a user’s UPN value when synchronising a federated domain from an on-premises Active Directory to Azure Active Directory used by Office 365. Problem Summary: You want to¬†update the user principal name (UPN) of an on-premises Active Directory Domain Services (AD DS) user …

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