Hi folks, just to close the loop on this thread and thank you again for your advice. I was able to successfully regain control of my personal Mac Mini M2 Pro by following Apple instructions for Erase All Content and Settings.
https://support.apple.com/en-us/HT212749
This seems to be the easiest way to restore your Mac to brand new state especially for Macs with a T2 security chip. It guided me through all the steps, signed me out of iCloud, and presented me with a new Mac to be activated at the end. Since I also had Google Drive running on my Mac Mini, I went to Google Drive settings to disconnect my account prior to commencing the process to wipe the Mini.
I experienced the following two glitches that I was able to resolve:
- When my Mac Mini started in new state, it failed to detect Internet connectivity through the Ethernet port that's connected via CAT6 cable into a Netgear switch wired to my router. I had to temporarily resort to WiFi after I spotted the icon in the upper right corner of the menu bar. Upon selecting my home WiFi network and providing the password, I was able to continue. After the Mini got activated, I was able to get to Network settings in System Preferences to turn off WiFi and leave only Ethernet on.
- I wasn't able to get my Mini to recognize my existing Magic Keyboard with Touch ID and Magic Mouse 2. No matter how many times I plugged and unplugged the USB to Lightning cable, I was unable to use the Magic Mouse 2. Of course, the Magic Keyboard would remain usable if left plugged in, but Bluetooth was clearly not working. So, I pulled out my old, wired Apple keyboard and wired Apple mouse to complete the setup. After I got to System Preferences, turning Bluetooth off and on is what solved the issue with my wireless accessories.
It was a relief to see all my iCloud files show up after I signed in with my Apple ID. Ditto for my Google Drive files after I installed Google Drive for desktop and signed in with my Google account. And the best part is that I now have zero device profiles showing in Privacy and Security -> Profiles whereas previously I had a zoo there.
So, all is well now. I learned two important lessons: Never enroll your personal device in corporate device management and always have Apple wired keyboard and mouse handy when reinstalling macOS.