Edit Managed Apple ID formats in Apple Business Manager
In some cases, it may be necessary to change the Managed Apple ID for accounts — for example, if the domain name of the organisation changes. Managers who have the “Create, edit and delete Managed Apple IDs” privilege can edit the Managed Apple ID of other accounts. This changes the Managed Apple ID format for all new and existing accounts.
After you change the Managed Apple ID, active users can sign in using their new Managed Apple ID and existing password. If the new format includes an element which is missing or empty for that user, the user’s Managed Apple ID will not be updated. If the new format results in a Managed Apple ID which is already in use, a number is added to the end of the new Managed Apple ID to make it unique.
Important: Users are not notified when their Managed Apple ID is changed, so you must notify them as soon as you make the change.
Edit the Managed Apple ID format for multiple users
In Apple Business Manager , tap Accounts in the sidebar.
Search for accounts in the Search Accounts field, then select the accounts you want to edit.
Tap Edit in the Accounts row, then do one of the following:
Change the Managed Apple ID’s unique username structure.
Change the domain name structure.
Tap Close, or wait until the activity has finished, then tap Done.