Why is this even an issue? Can't even join my wife's fireteam and our Xboxes are right next to each other on the same damn modem. Can't even enjoy the game because Bungie screws away integral parts of the game with these "patches." This is why Bungie loses customers......hope you're reading this Bungie.
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I've seen a few threads with the same issue. Have you tried clearing your cache? Clearing it should delete the old data disallowing you to join other members. Also, verify you have downloaded the most recent patch. Source: [url=https://www.bungie.net/Mobi/en/About/Article?id=12539]https://www.bungie.net/Mobi/en/About/Article?id=12539[/url]