i tried this with my girlfriend but it only worked with their controller which i couldn't make vibrate so is there something were missing?
were using the demo version if that helps.
to clarify they could make it vibrate but i couldn't
So the way you can control your partners gamepad is by clicking the onscreen controls with your mouse; that will control your partners gamepad . With the demo, the onscreen controls are locked so you will need the full version. If Parsec is not working for you either after this, you can always try Steam Remote Play too. Buying from Itch will also give you a Steam key so you can use either one.