Change a Username and email address in Office 365 Admin Center

You might need to update someone’s email address or display name, for example, if their last name changes after marriage. This guide shows you how to make those updates in the Microsoft 365 admin center, step by step.

Before you begin

You must be a Global Administrator to make these changes.

Change a user's email address

Go to Microsoft 365 admin center

Users > Active users

Select the user’s name

Enter the new email prefix and select the domain from the dropdown

Under the Account tab, choose Manage username

Save changes

Set the primary email address

Go to Users > Active users

Select the user

Under the Account tab, choose Manage email aliases

Click Set as Primary next to the email you want to make primary

Confirm the warning and click Save, then Close

2. Give the person the following information:

   • This change could take a while.

   • Their new username. They'll need it to sign in to Microsoft 365.

   • If they are using Skype for Business Online, they must reschedule any Skype for Business Online meetings that they organized, and tell their external contacts to update their contact information.

   • If they are using OneDrive, the URL to this location has changed. If they have OneNote notebooks in their OneDrive, they might need to close and reopen them in OneNote. If they have shared files from their OneDrive, the links to the files might not work and the user can reshare.

   • If their password changed too, they are prompted to enter the new password on their mobile device, or it won't sync.

Change a user's display name

2. Select the user's name, and then on the Account tab select Manage contact information.

3. In the Display name box, type a new name for the person, and then select Save.

   If you get the error message "We're sorry, the user couldn't be edited. Review the user information and try again, see Resolve error messages.

It might take up to 24 hours for this change to take effect across all services. After the change has taken effect, the person will have to sign in to Outlook, Skype for Business and SharePoint with their updated username.

Resolve error messages

"A parameter cannot be found that matches parameter name 'EmailAddresses"

If you get the error message " A parameter cannot be found that matches parameter name 'EmailAddresses" it means that it's taking a bit longer to finish setting up your tenant, or your custom domain if you recently added one. The setup process can take up to 4 hours to complete. Wait a while so the setup process has time to finish, and then try again. If the problem persists, call support and ask them to do a full sync for you.

"We're sorry, the user couldn't be edited. Review the user information and try again"

If you get the error message " We're sorry, the user couldn't be edited. Review the user information and try again." it means you aren't a global admin and you don't have permissions to change the user name. Find the global admin in your business and ask them to make the change.

What to do with old email addresses

A person's previous primary email address is retained as an additional email address. We strongly recommend that you don't remove the old email address.

Some people might continue to send email to the person's old email address and deleting it may result in NDR failures. Microsoft automatically routes it to the new one. Also, do not reuse old SMTP email addresses and apply them to new accounts. This can also cause NDR failures or delivery to an unintended mailbox.

What if the person's offline address book won't sync with the Global Address List?

If they are using Exchange Online or if their account is linked with your organization's on-premises Exchange environment, you might see this error when you try to change a username and email address: "This user is synchronized with your local Active Directory. Some details can be edited only through your local Active Directory."

This is due to the Microsoft Online Email Routing Address (MOERA). The MOERA is constructed from the person's userPrincipalName attribute in Active Directory and is automatically assigned to the cloud account during the initial sync and once created, it cannot be modified or removed in Microsoft 365. You can subsequently change the username in the Active Directory, but it doesn't change the MOERA and you may run into issues displaying the newly changed name in the Global Address List.

To fix this, log in to the Azure Active Directory Module for PowerShell with your Microsoft 365 administrator credentials. and use the following syntax:

Set-MsolUserPrincipalName -UserPrincipalName anne.wallace@contoso.onmicrosoft.com -NewUserPrincipalName anne.jones@contoso.com

To learn how to change someone's username in Active Directory, in Windows Server 2003 and earlier, see Rename a user account.

Related content

Add a domain Admins: Reset a password for one or more users Add another email address to a user Create a shared mailbox

Source: https://docs.microsoft.com/en-us/microsoft-365/admin/add-users/change-a-user-name-and-email-address?view=o365-worldwide