Thanks a MILLION for this incredible tip! I'd just received my new 2021 MacBook Pro M1 Max and installed Windows 11 ARM... but couldn't get it to install ANY software since the Microsoft Store was missing. Followed your GamePass installation steps and BOOM Windows 11 ARM now allowed me to install my apps.
Device name MBPM1Max
Processor Apple Silicon 3.20 GHz (4 processors)
Installed RAM 8.00 GB
Product ID 00330-80000-00000-AA553
System type 64-bit operating system, ARM-based processor