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Someone declined the invite. You were placed at the front of the queue.
I queue with a 4 man team and it still won't let us in on the first, second, third, fourth, or even fifth try. *kicks dungeon finder in the sweet spot*
Someone declined the invite: the someone is usually is the server, second suspect is the butler.
As op says, you get this in an 4 man group wanting an specific dungeon now.