Having the devices in Apple School Manager (ASM) should be enough to provide activation lock clears. The Devices can be unlocked using the district's Mobile Device Management (MDM) system, which allows you to lock/unlock a supervised Apple device without requiring the user to sign in to their iCloud account on the device, or allows you to ensure that you’re able to remove Activation Lock when it’s locked to a user. You can use the Activation Lock bypass code in place of a password to unlock a device and erase it.
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In the Profile Manager
sidebar, click Devices.
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Select a device, click the About tab, then click the Security triangle, and locate the activation lock bypass code.
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Enter the bypass code in the password field of the Apple ID on the device you want to erase. Leave the Apple ID user name blank.
The device is erased and can be set up again. You must set up Activation Lock again and generate a new code. These instructions and descriptions are very helpful.
(Your MDM manager should be able to walk you through this process.)
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