Why this matters
Apple Business Manager is the entry point to everything Apple Automated Device Enrollment enables: zero-touch enrollment, supervised management, non-removable configuration, serial-number inventory. But linking ABM to your management plane is not a one-click operation — it requires creating and uploading a public-key certificate to Apple, generating a service token that expires every year, and standing up the APNs push certificate that actually drives MDM commands. Get any step wrong and enrollment silently stops working the next time a device is set up. Get the certificate rotation wrong and every enrolled Mac in the fleet de-enrolls on its own.