I came across this support article from Apple today. This is the first I’ve heard of the T2 security chip on the newer Macs ever becoming unresponsive. According to Apple, it is a very rare problem.

After reading this document, I believe I may have seen this problem a time or two at my last job. There was one MacBook in particular, a 2018 15” model, on which I could not reinstall MacOS to save my life. Nothing I tried worked. Now, I’m almost positive the T2 chip was the culprit.

Rare or not, I’m glad I came across this support document. It’s a nice bit of information to have in the ‘ol arsenal of knowledge.