iCloud: About Managed Apple ID accounts
If the iPad you’re using is administered by your school, you may receive a passcode (to turn on or wake up iPad) and a Managed Apple ID (to access Apple features like iCloud Drive). You can use iCloud.com with the Managed Apple ID given to you by the school. However, some standard iCloud.com apps, features, and settings are not available to accounts with Managed Apple IDs. For more information, see What are Managed Apple IDs? in Apple School Manager Help.