The entrance to this mission is inside The Hive which is a poplar zone that leads to Dephs of Darkhollows biggest flag raid and the end zone let alone people exp in it. The bug comes in that this mission cannot be entered from the pick and only from the base. I had to sit around for thirty minutes for the base to clear out from seventy people just so I could enter the base to be able to zone in and begin the mission.
Isn't players blocking the way. When they made picks some instances just couldn't be entered while in a pick which they fixed but some got missed and this is one of those ones.
The Hive is most definitely not a popular zone -- unless you're on a progression server. So that might be a good piece of info to include.