Disconnect federation from a domain in Apple Business Manager
If you no longer plan to use federated authentication with a domain, you can disconnect the domain. This process does not affect the domain verification.
Note: You cannot disconnect from a federated domain if Apple Business Manager is in the process of enabling federation or resolving conflicts with other Apple IDs.
Disconnect federation from a domain
In Apple Business Manager
, sign in as a user that has the role of Administrator or People Manager.Tap your name at the bottom of the sidebar, tap Preferences
, then tap Accounts 
.Tap Edit next to Domains, then do one of the following:
If federated authentication is turned on, turn it off, then tap OK.
If federated authentication is not turned on, tap Disconnect, then tap Disconnect.