Sign out devices in Apple School Manager
If you’ve successfully configured federated authentication, you can sign a user out of all devices associated with their earlier Apple School Manager sign-in.
Sign out devices
In Apple School Manager , click Accounts in the sidebar.
Search for an account in the Search Accounts field, then select the account you want to change.
Click More , select Sign Out Devices, then click Sign Out Devices.
The user must sign back in with their federated account information.