Which generation of Surface Studio you have (Studio 1, Studio 2, or Studio 2+)
Microsoft specifically notes that when touchscreen and Pen inking fail together on a Surface Studio, the cause can be the touch/digitizer system, either software/driver related or hardware related.
- Shut down the Surface Studio completely.
- Turn it on and enter UEFI.
For Surface Studio, Microsoft recommends using the hardware-button method to enter UEFI. Once there, try touching different areas of the screen with your finger. Microsoft says UEFI operates independently of Windows, so this is a very useful hardware test.
If touch works in UEFI
Then I would work through the Windows side rather than replacing hardware.
But if touch DOES NOT work in UEFI...
Don't waste time reinstalling Windows over and over.
That would be the strongest indication that the problem is in the Surface Studio's touchscreen/digitizer hardware, rather than Windows 11. Microsoft explicitly says that if touch doesn't work in UEFI, the touchscreen most likely has experienced a hardware failure.
Microsoft's reference article: