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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We've got exactly the same issue only on PS4. No error codes, just "unable to join fire team". Its only been happening since the patch.