Whenever you join a friends party while in-game, you can only hear them if you have the party "snapped" if you unsnap it, you wont be able to talk to your friends unless you exit the game completly. Something Bungie should know about and fix.
English
#feedback
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Same here. While switching to in-game chat is a good workaround, there will be times where I want to party it up with people playing other games. Pri-1 bug!