To integrate with the Device Enrollment Program, you must complete the following requirements.
An Apple DEP account – Register for a DEP account. If needed, enroll with Apple using the Apple Enrollment Procedure.
Apple devices – Any macOS, iOS, and tvOS devices that you want managed through DEP must be associated with a DEP account.
Devices purchased from a Third party or reseller must be associated with your DEP account. To make sure that the devices are DEP-eligible, check with your reseller.
When enrolling devices, you must have Internet connectivity.
When integrating with the Apple DEP portal, ensure that the network is set up to communicate with mdmenrollment.apple.com on port 443, as for some on-premise clients.