When you play a game on Stadia, you can choose whether game publishers can use your friends list data to enable some in-game multiplayer functionality.
You can always change this for any publisher whose games you play from SettingsFriends & PrivacyGames using your friends list.
This will allow you to:
- See your friends list in a publishers’ games
- Invite friends to play the game with you
Note: Turning on this setting for a given publisher only gives that publisher access to Stadia Names of your friends.