Xbox Game Pass (PC) Unable to Launch any Games

Hi just call Microsoft and tell them what's going on.

Use this link to contact Xbox Support https://beta.support.xbox.com/contact-us

Hello Wtty12, I am an independent advisor and I will be happy to help you today. My name is Khaji

I understand that you are having problems starting Game Pass games and that the steps you have followed online have not resolved the problem, I also want to remind you that I am a PLAYER just like you, just with a little more experience in Software and Hardware, Therefore I always do my best to help all Players who need support and assistance.

Repair and reset the Store app and Xbox app: Go to Start > Settings > Apps > Apps & features > Microsoft Store > Advanced options > Repair, then Reset. Do the same for the Xbox app

Delete temporary files: Press Windows + R. Type TEMP and press enter. Delete all files inside this folder. Repeat this step by typing %TEMP% and Prefetch

Move games to a different drive: Go to Settings > Apps > Apps & features. Click on an app and click the “Move” button. You will be asked to select another drive, and you can click “Move” to move the app to that drive

Check offline usage permissions: Open the store. You will be asked to log in if you have not already done so. Select your profile icon in the upper right corner. Select App Settings, and then under Offline Permissions, make sure the switch is set to On

Update the Xbox app: Make sure your Xbox app is up to date

If after following these steps the problem persists, I would recommend contacting Xbox support for additional and more direct help.

If after this you can't solve the problem, I will be here to continue helping you,
but remember and keep in mind that I am a Player just like you
than with little more knowledge regarding Software and Hardware.

Download the Xbox Game Pass for PC | Xbox app on PC. Launch app, sign in and enjoy.

Got it working ! Referred to this post :

Xbox game pass on pc not launching some games - Microsoft Community