Editing custom attributes using the Microsoft 365 admin center

  1. Log in to your Office 365 tenant and click the Admin app.
    Set up custom attributes in Office 365 01
  2. Next, go to Users > Active users.
    Set up custom attributes in Office 365 02
  3. Select a user with an active mailbox to access their properties. Then, go to Mail > Edit Exchange properties.
    Set up custom attributes in Office 365 03
  4. Click More options to expand the window to show custom attributes. Next, click the Edit button to add additional fields.
    Set up custom attributes in Office 365 05
  5. A new window will open. Here you can modify custom attributes for the selected user.
    Set up custom attributes in Office 365 06