Update!!! I found the culprit - I am posting it here to help anyone else that has gone through this process, I've spent several weeks on it. I am not sure why Microsoft doesn't know it?!?
I learned about it from this website. Please note all I had to do was turn off 'audio enhancements' in the system sound panel (I personally did not have to do any of the other Realtek steps mentioned) - and the Kinect V2 started working in Windows 11.
https://ar-sandbox.eu/docs/kinectsandbox-software/troubleshooting/
https://www.youtube.com/watch?v=0VWnc66nrMc
Kinect v2 on Windows 11 fix: Go to System → Sound → Properties for the Kinect microphone device and disable Audio Enhancements. This prevents Windows 11 from injecting DSP effects that cause USB resets on Kinect v2 composite devices. No driver reinstall or hardware changes required.