You need to link your Stadia Controller to a screen before you can use it to play. In order to play on a TV with Chromecast, a mobile device, or on web with Chrome, you’ll need to use a linking code to link your Stadia Controller wirelessly.
What is a linking code?
To let your Stadia Controller know which screen you want to play on wirelessly, you’ll need to enter a linking code for that screen. The linking code lets you easily change which screen your controller is linked to. Each screen will have its own unique linking code that will rarely change.
Enter linking codes from left to right, one button at a time. Linking codes are 4-5 characters long and consist of only Up, Down, Left, Right, A, B, X, Y.
Here is a sample of what a linking code looks like. The code for your screen will be different.
How to link with a Chromecast
Press the Stadia button for one second to turn on your Stadia Controller. The controller will vibrate. If you have not previously setup the controller with Wi-Fi, you can follow the instructions here.
As soon as the status light blinks white, enter the linking code displayed on your Chromecast Ultra in Ambient Mode.
It can take up to 15 seconds for the entered linking code to be recognized. If the link was successful, the controller will vibrate and Stadia will launch on your Chromecast Ultra. The status light on your controller will turn solid white when it is linked to the screen.
Note: If the status light blinks orange, it means the controller can’t connect to Wi-Fi. Open the controller menu in the Stadia app to set up the controller with Wi-Fi. If you need to change the Wi-Fi on your Chromecast, use the Google Home app.