Remove a domain in Apple Business Manager
You can remove a domain from Apple Business Manager if you no longer need to use it. If Managed Apple Accounts have been created using the domain, you are prompted to update the domain of existing accounts as part of the removal process. If the domain is federated, federation must be turned off first. Removing a domain also removes the domain lock.
Remove a domain with no Managed Apple Accounts
Complete this task to remove a domain that has no Managed Apple Accounts associated with it.
In Apple Business Manager
, sign in as a user that has the role of Administrator or People Manager.Select your name at the bottom of the sidebar, select Preferences
, then select Managed Apple Accounts 
.In the Domains section, select Manage next to the domain you want to remove.
Select Remove Domain, then select Remove Domain.
Remove a domain with Managed Apple Accounts
Complete this task to remove a domain that has Managed Apple Accounts associated with it. After you complete this task you must notify affected users they must sign out and sign back in.
In Apple Business Manager
, sign in as a user that has the role of Administrator or People Manager.Select your name at the bottom of the sidebar, select Preferences
, then select Managed Apple Accounts .In the Domains section, select Manage next to the domain you want to remove.
Select Remove Domain, then select Update Domain Name.
Choose a new domain for the users, then select Continue.
You can wait for the activity to complete, view the activity, or select Close to close the window.