@phaedrux Running two printers of my Surface (other printer is a Prusa Mk 2.5S that I changed to Duet 5 Mini board.)
So I shut everything down. Power cycled the Surface. Open DWC and grabbed the file you linked (thanks for that) and ran the upgrade. This time it worked. Not sure if for some reason the web browser was the thing not letting the upgrade finish.
But now, with latest firmware, the plugin sees the accelerometer and it actually ran the routine.
So I think we are good to go. Thanks for all the help!