@XXDXX
Here is what Apple has to say about getting the devices enrolled.
If you’ve acquired devices outside of Apple or participating Apple Authorized Resellers or carriers, they can
also be added to DEP using Apple Configurator. When you set up a device that has been manually enrolled,
it behaves like any other enrolled device, with mandatory supervision and MDM enrollment. However, the
user has a 30-day provisional period to remove the device from enrollment, supervision, and MDM.
Learn more about how to manually enroll you devices.
I even left the typo that is in the Apple DEP document.
https://www.apple.com/business/site/docs/DEP_Guide.pdf
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