We have a bunch of computers with user enrollment on InTune but are not assigned to a DEP instance. I want to export the serials and upload them to Apple Business Manager to bulk add all eligible devices in one sweep. My concern is that it will cause issues with the InTune MDM management. They will eventually get migrated to Jamf via user enrollment, but in the meantime I would at least like to get them added to the ABM/Jamf DEP token so we have "ownership" of the devices if they are wiped any time soon
It‘s not possible to register the Macs just via a list of serial numbersInto ABM. The initial registration must be done through a DEP Reseller. Just iOS devices can be registered through Apple Configurator to appear in the ABM.
After this step is done you can assign jamf or any other mdm server to the several serial numbers.