Hello.
I bought my Surface Pro 7 less than a month ago, up to date with firmware and software updates, Windows 10 Pro version 20H2 build 19042.867. Today I noticed the touchscreen feature is not working, not even with the UEFI screen. I tried several solutions I found, but nothing worked. Finaly I think I can say that it is not a hardware issue, but a software one.
The touchscreen comes back to life when I uninstall both "HID compliant touch screen" and "Intel Precise Touch Device" drivers and reboot.
However the touch stop working 5, 10, 20 or more minutes after rebooting. I can't find a pattern to confirm what causes it to stop working again, sometimes plugging/unplugging the Surface Dock also affected, but not every time.
I hope this helps other people, at least temporarilly.
Regards.