You may have a firmware password on the device. Try that. Firmware will
show the simple lock icon. After you get past the lock, you will be
presented with a new screen with square boxes that will take your Wipe
PIN Code.
I don't have actual documentation but this is what both Apple and JAMF
told me for a migration of MDMs. OLD MDM Supervision Backup > NEW MDM
(via DEP) Supervision > Restore to an alternate deviceOLD MDM
Supervision Backup > NEW MDM (via DEP) No Super...
