Turn the controller off and then open up the stadia app. Then click on the controller icon and let it search for the controller. While it is doing this hold down the main stadia button and y on the co...
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Turn the controller off and then open up the stadia app. Then click on the controller icon and let it search for the controller. While it is doing this hold down the main stadia button and y on the controller at same time and once you see the flashing orange light, let go. It will then get picked up by the app and will take you through the connecting process