Q:
Where is Southsun AT?
If you click on the Show Me link on the bottom of the mail you got regarding it, it’ll show you where the gate is in Lions Arch.
Go to the Consortium Outpost in Lion’s Arch. Step through the gate to SouthSun. Don’t step in the fractal gate.
Alternatively, go to the harbour in Lion’s Arch, talk a guy at the end of a dock next to a boat. I think he has a little boat icon above his head. Take the boat to SouthSun.
There’s a new asura gate in southern Lion Arch that will take you there. I think you can still take a boat there from the Lions Arch harbor. You will see a sailbot icon on your minimap.