Can not participate in the weekly Flashpoint on my Warlock or my Titan; I've completed the Flashpoint on my Hunter this week on the Tangled Shore.
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I'm having this problem as well, it has nothing to do with the campaign. My Titan hasn't completed any of the quests on the Moon, but still has access to flashpoint just for being over 900LL. I've finished it on my Hunter and that one can't even access the Flashpoint and is 911LL