Unable to get ABM prompt on freshly wiped Mac

I have a Mac Mini 2018 which is not presenting the ABM prompt when I bring my iPhone 12 running Apple Configuration Manager near it. This machine (which has been in use for a few years) has been wiped and has a fresh install of Monterey 12.2 on it.

Upon first boot after a fresh reinstall, it goes directly to the "Select your Country or Region" screen (it completely skips the language selection prompt for some reason). I launched ACM on my iPhone 12 and sat it atop the Mac Mini for several minutes, but nothing happened.

Is there something I am doing wrong?

In case it matters (and knowing my luck, it probably does), I do have the T2 Security Utility configured for "Medium Security" and "Allow Booting from External Media" as I will need to roll back this machine to Catalina after the 30-day grace period completes.

Unable to get ABM prompt on freshly wiped Mac
 
 
Q