Shutdown -p now; Not Powering Off

[MG]

Would you know how I can troubleshoot this a little deeper before I try and report it?

There are many things to try to exclude possible causes.
Power-off still doesn't work without anything except / mounted? This means it's not a storage device having trouble.
What happens after the physical shutdown button? In case no power-off, the PSU doesn't get a signal from the operating system. --> Is the ACPI module present and working correctly? But is NUC ATX anyway? It could be different.
Many more things...

 

[bgavin]

Actually the Microsoft team released a registry setting that disables TPM checking.

You incorporate this setting into unattended install xml file.

This is also where you disable installing the bloatware. This yields a lean install which is superior to post install removing of bloat.

I have zero need for UEFI or TPM on machines I use for productive work.