how do u play the game with friends on remote play

Hello guys, mormaly it's possible to play with a controler but I don't understand why it doesn't work. If somebody has a solution it will be great

I cant see the damn ball when its time to serve lmao. A way to change the resolution would be nice. Another thing thats bothering me is how delayed some moves are.but i guess that just takes getting used to, still would be cool to have an instant response...