PKID, a 13-digit number that corresponds to the Windows product key that was inserted into the firmware of the device at manufacturing time (using OAv3). ProductKey: This is the Windows product ID, a.k.a.Partners would only have this value if they get it from the OEM (and booting up the device to get this, then putting the device back in the box is an absolute last resort – not only is it expensive, but it can cause problems for the customer later on). Customers use this value to register existing devices. HardwareHash: The 4K string retrieved from a running Windows 10 OS on the device.SerialNumber + OemManufacturerName + ModelName.

HardwareHash + ProductKey + SerialNumber.What I stressed in that blog is that there are multiple ways that devices can be identified: As I discussed in a previous blog, CSP partners (who could be distributors, resellers, or service providers) are able to register devices for Windows Autopilot on behalf of customers using Partner Center, either interactively (upload a CSV file) or via the available APIs.