Xiaomi Mi A1 - Touch screen, capacitive buttons, fingerprint scanner dead
I'm sorry. but I believe that it is a hardware issue. The touch feedback and the capactive key feedback is sometimes carried over by the same flex ribbon. So, it could be either a loose connection of the flex cable and/or a broken flex cable or some other type of hardware issue with the touchscreen.

The fingerprint should use a separate connection and it definitely does as it is on the back. So, it could also be something wrong with the motherboard.

I do not see a software issue here. Also, with all that you have tried, I do not see much that you are left with. The best idea would be to bring the device to a Xiaomi service center. I hope you live in a location where it is officially sold and you have warranty coverage.