Corporate computer keep enrolling to unknown MDM profile, even after format/reinstall
I am IT manager of a company owning several Apple computers and I have a specific MacBook Pro 2018 that were provided to an employee who left the company a few months ago and then when I get back our corporate laptop to clean it and provide it to a new employee, I noticed an unknown MDM profile installed into our corporate computer that isn't our MDM. I just formatted the computer then re-install MacOS Catalina from scratch (from USB thumb) and immediately after the install complete, before even creating any user account, I have a prompt that tells me that "XXXXX can now remotely manage my computer".
I just hang the phone with the AppleCare technical support line and they never hear of this behavior (??!!) and my call has even be elevated to a senior supervisor.
It looks like something is "pushing" data to our corporate computer without our agreement. So what are the options?