If available, send the list of serial numbers included in your order to your CSR.
Ensure the MDM Feature “Erase all Contents and Settings” is available and not restricted for all devices.
Remove any PIN codes or Usernames from your devices.
Log into Apple School Manager and disable Activation Locks on devices.
Fully “Release” devices from Apple School Manager. (Devices unassigned only will not allow SLM to erase).
Export list of released devices for your records, and send to your CSR for verification.