Yeah there are tons of posts about it in here. It happened to me. Got stuck at 11/12 progress. The only responses from anybody at Bungie so far are literally "better luck next IB". It's doubtful Bungie will even officially acknowledge it, at least so far
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Lol awesome..... well I guess as long as they give us enough challenges to finish it. Be perturbed to miss it due to missing one challenge two months later lol