Party chat is tied to your console; fireteam chat is what runs through Destiny, so you might not get exactly the help that you need in this forum. Anyways, with party chat, it could be that a NAT type (network address translation) error occurred. Which console do you use?
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Xbox 1
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Here are a couple of links that might help with party chat on the Xbox One: [quote][url=http://support.xbox.com/en-US/xbox-one/networking/nat-error-solution][i]"I can't hear my friends online, or I can't join or host a multiplayer game with my Xbox One"[/i][/url] [url=https://support.xbox.com/en-US/xbox-one/system/troubleshoot-parties][i]You can't switch to party chat on Xbox One[/i][/url][/quote]