Can I use my PS4 controller on Xbox (the PC app) in order to play game pass games on PC?

You can play on Xbox Family console and you can use your controller. But i think the game launch on PC too with the Xbox Game Pass PC.

I played on my pc

using the Xbox app along with game pass

Hello again, I have found a -flawed- solution, I can play the Game Pass Ultimate games with my own account, so I won't disturb my brother.

The Xbox (beta) app uses the PC account for the subscription, so only logging in the companion app and the Xbox (beta) app with my brother's account doesn't work, because the Xbox (beta) app uses MY account and not my brother's.

I have then created a second account on my PC, using my brother's e-mail address and logged in the companion app with my account, downloaded a game, launched it, and played with my account. So it works, but it is annoying that I have to switch
to the second account on my PC in order to play the Game Pass games. Maybe in the future they'll make it more convenient.

Thakns again for your help, have a nice day!

If you have bought Game Pass Ultimate, then it includes Games Pass for Xbox, Game Pass for PC, EA Play for Xbox, Cloud Gaming on android & Xbox Live Gold. So yes, you can use it on your PC.

It's simple to use, download the Xbox app on your PC, log in with the account that has Game Pass Ultimate, and then download a game from the app, once downloaded, start the game.

Is it possible to install an xbox game on pc and play it?

Hello, This is Elijah.

Microsoft/Xbox allows players to "Buy once, Play Anywhere" on PC or Xbox. The game list is extensive but does not cover all.

Simply visit

https://www.xbox.com/en-US/games/xbox-play-anywhere

if you own the game (make sure to sign in first) you can play any of those games, on PC or Xbox.

Xbox Game Pass Owners have access to the Xbox App (PC) games that are installable to PC and Xbox.

Visit https://www.xbox.com/en-US/apps/xbox-app-for-pc for Xbox App (PC) for the official app for PC.