This should sync the change to Office 365. Troubleshooting In case you are looking for steps in PowerShell V1, please refer to the article here nicely documented by my colleague.. Queries-Will their existing on-premise AD profile change when they login to the laptops after this SAMAccountName change? You can check the UPN of an Office 365 user in the Users > Active users section in Microsoft 365 admin center (Office 365 admin center), as shown in Fig. Main impact is MDM. In some situations, we need to change the UPN for some users either to match the UPN with users’ primary email address or if users are created with UPN that ends-with .onmicrosoft.com (user@domain.onmicrosoft.com). In Office 365, UPNs are displayed in the Username column. UPN: JohnDoe@contoso.com . In the Windows operating system’s Active Directory, a User Principal Name (UPN) is the name of a user. Due to policy change, all AD users, which username is DOMAIN\12345 will be changed to DOMAIN\0000012345. Office 365. With the UPN suffix added, verify the respective users that need to logon using the new UPN have this set for their Active Directory user account. I saw a difference in the migrated and non migrated Office 365 AD accounts which is as explained below: ... migrate the content first and then do the user move later. We start with the Active Directory Rename the … First, we must connect to the Office 365 tenant using PowerShell and change the UPN for all relevant users to the vanity domain "tenant.onmicrosoft.com". The on-premises UPN is not same as the user's email address and to sign-in to Office 365, users use email address and UPN cannot be used due to organizational constraints. This will only impact … But nothing will happen if the users are already have a federated domain set as the UPN. 3. This issue occurs if changes are made to the user principal name (UPN) for the user and the Mailnickname attribute value is changed to the prefix of the UPN. The UPN address is also present in Office 365, where it is assigned by default for any new user. When you want to change the user UPN, in certain conditions, this UPN change will not be synchronized to AAD (Office365/Intune/other).. why? After that, the work or school account is bound to the on-premises user by an immutable identity value instead of the UPN. i can provide the mapping and update the user with changed upn value but i doubt whether it will work or not. Users must be educated to recognize when to use their Office 365 login or their Office 365 email address to login to their mailbox. With the domain added and verified, logon on to the primary ADFS server in your environment and open the ADFS 2.0 Management Console. Azure AD and Office 365 require all domain suffixes associated with Azure AD directory to be fully internet routable. Their display name will be retained (e.g. A client of mine has decided to change their company name and default email domain, an I have a few questions about what this impacts. When a user's Office 365 sign-in address (also known as the User Principal Name, UPN, or user ID) is changed, the Skype for Business Online (formerly Lync Online) SIP address for the user is … 10 things you should know about moving to Office 365 by Brien Posey in 10 Things , in Collaboration on May 3, 2012, 2:33 AM PST If you're planning a move to Office 365… Can I simply add the new domain to my current Office365 tenancy, or do I have to stand up a whole new Office 365 tenant, specifically for the new domain?