Device Not Showing as Supervised After Full Erase - Still showing up as managed in ABM Dashboard.

You have something misconfigured. The device is not released from ABM, it is simply not assigned properly to the MDM. If it is enrolling successfully into the MDM and then upon restart, the device is no longer enrolled, then it still points to a misconfiguration of the MDM.

If you have not connected your MDM to ABM properly, and then in ABM assigned the device to that MDM, then you will not see one of those screens. If the token is not valid to connect the MDM, whether because it is expired (it expires yearly) or because the account that connected it is locked out (I have a ticket in with Apple because this shouldn't happen - and it doesn't happen with a push cert or VPP token), then you will also not see that screen. In your MDM, you'll want to make sure there are no errors on the configuration settings. This should indicate whether the token is expired or invalidated because of lockout (though it may not depending on the MDM).

Either way, the first step I would take is renew the token connecting the MDM to ABM and try again.

Log into ABM and search for the device's serial number. When the record appears, what is its status? Is it "released?" Is it assigned to an MDM? Is it assigned to the correct MDM?

If the unit is released, then it sounds like you may be permitting hardware release from your MDM. To determine if this is the case, go into ABM, select your name in the lower left corner and choose Preferences from the pop up menu. In the middle column, select the MDM server that the device was originally enrolled. In the right panel, press the edit button. Is the box "Allow this MDM Server to release devices" checked or unchecked? If checked, then hardware can be dropped from chain of custody from the MDM (released from ABM). If unchecked, then hardware can only be released from ABM. If the unit is released they you either need to reach out to your reseller and ask for it to be reassigned (must be the reseller who sold that particular device) or you can use Apple Configurator to sideload the asset back into ABM.

Go back to the device record by searching for its serial number. Is it assigned to an MDM? If it is assigned to the wrong MDM, then reassign it in ABM. While on the device record, hit the Edit MDM Server button at the top of the right panel. Assign the device to the correct MDM. What up to 15 minutes to make sure your MDM server syncs with ABM. (It is usually faster but...)

Ok, now there still may be an issue on the MDM. Log into your MDM and review the prestage policy. Do you have it set to automatically assign new devices? If not, then manually assign the device to the prestage policy. If you have a device assigned to an MDM server in ABM but do not associate the device to a prestage policy in the MDM, then the device goes nowhere. Once again, after assigning the asset tot he prestage, wait a couple of minutes. Then reset the device so you can go through the setup assistant. Remember, resetting the device will delete all data.

Hope this is helpful. Start with the serial number and validate the state and presence of the device through the entire management chain. This starts in ABM and flows through the MDM.

Reid

You'll want to contact your MDM vendor(s) about this.