[my123]

So, it actually is X1C and A78C.

https://blogs.windows.com/windowsexperience/2022/02/28/mwc-2... references PAC support, which is only in the C variant of those cores.

[PennRobotics]

Good catch. I wasn't even aware there was an X1C! Then again, my daily driver is a 1 or 2 core Cortex-M. On special occasions (once a month or so) something more exotic lands on my desk.