We are currently on ePO 5.3.2. We are moving to ePO 5.10 (build 2428).
We created a new agent package on the new ePO and installed it on a laptop with MDE 7.2.8. It works just fine -- it communicates with the new ePO, no problem.
The problem occurs, though, at pre-boot. Users are neither being retained nor added. In fact, there are no users added to this device at all. It was on the network for about three hours before it was turned off.
What should we be doing to ensure that users are being transitioned properly from the old ePO to the new ePO?