the problem are bots, too many bots are running this dungeon. you cant even enter it if you queue for it solo, which means the problem arent not enough players, the problem is all instances for that dungeons are full. it makes no logical sense that so many normal people would queue for that dungeon so it must be full of bots, just like the temple of qarn and wanderes palace, they farm gil so they cann sell it on their shity website and SE is doing absolute nothing to stop those bots