I've 800 machine model name is DELL Optilex 780.
All machine have Vpro funtionality and half from 800 machine already provisioned and can using OOB.
Balance from 800 machine not provisioned. Status said PC unknown, detected and un-provision.
Everyday i'll Randomly choose few computer. Boot into MEBX and login to using the password you configured Perform Full Unprovision and Restart the computer.
attached amtopmgr.log :