I think you can't? I mean when I'm in a 6 man fireteam self made, We talk all the time. But when I matchmake nobody seems to have a mic. Seems weird to me. Since every PS4 has a mic. So maybe you need to be in a fireteam? I don't know. It just seems hardly unlikely that I always had a matchmaked game where nobody has a mic on.
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You can only talk to those in your fire team. No one else. Lol
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Ah that what I thought.