Thank you, understood. Yes, we already use the IMEI as Device ID.
We have created another field, "Device Name", where we keep the asset number of the device. Now all devices have already been imported from the previous MDM solution, all IMEIs, Device IDs, Device Names. Now we want to bulk add the thousands of devices without having to manually add any information.
That should work, no? Otherwise, why would we have imported the device list in the first place...