ok - you don't say which Yoga C940 you have - I see two models on their site; but either way lenovo do not seem to provide anty windows 11 specific drivers, which may mean you use the windows 10 but you would have to check

also did you check to see if the .DLL files are in your directory

it seems that lenevo only do windows 11 specific wintab drivers for thinkpad, could not see any for the yoga

may be lenovo, or xara, could give you some advice