You have 2 options. First is to add it DEP via Apple Configurator as some have stated. This will Supervise the device and add it to your "Apple Configurator" MDM server in ABM. Then you just log into ABM and assign it to an MDM server like you normally would. However as others stated, there is a 30 day period the user can remove the management from the device. There is no way around this. Your 2nd option is similar to the first but it is the choice I prefer. I created an OG in AirWatch called "Configurator Staging". I set up the Automated Enrollment for this OG as opposed to DEP. When you do that you can export the profile from AirWatch and create a "Server" in Apple Configurator using that Profile. So when you run through the "Prepare" process on Configurator you still join it to DEP but you assign it to the Server using the Profile you exported. This will join it to DEP and enroll it into AirWatch. Then you go into AirWatch and move it it where it needs to go. That being said you will still want to go into ABM and assign the device to whatever MDM server you want but this way you don't have to wipe the device again a 2nd time. Those are really your only 2 options.
