Try a hard reset. Back when I played destiny I had that same problem with matchmaking. Unplug the power cord (while the console is off obviously) from the back of the console (yes, from the console, not from the wall), wait about 5 minutes, then plug it back in and turn it back on. It should work after that.
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I've already tried this once, but I'll give it one more try just for you.
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Lol, good luck.