I've a friend that I can talk to but he can't talk to or hear the third person in my fireteam. they both can't hear or speak to each other even though I can hear and speak to them both. wierd.
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Is it turned on!!!
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Just be thankful you can still the game. I can't get past the log in screen
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Have everyone one in a party, and if you did keep the party snapped if you have xbox one...