We have the exact same issue on an iPad, with the message ”your microphone is muted but connected to game chat” . My guess is that iOS doesn't support game chat at the moment. However, "party chat"...
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We have the exact same issue on an iPad, with the message ”your microphone is muted but connected to game chat” . My guess is that iOS doesn't support game chat at the moment. However, "party chat" works in the Stadia menu. But this only makes it possible to use voice chat with invited Stadia friends, and not with strangers in game (such as PUBG). We have had no luck to get game chat to work on our ipad after testing many different things (wired headset, wireless headset, using the ipad mic with no headset). Also, Safari is allowed to always use the microphone which explains why "party chat" works. My guess this is an issue on Google's side and game chat is currently unavailable for iOS. We also tried on our laptop PC and there game chat works directly with no problems.