Unable to access Trial of Sekhemas

Guess I didn't grab the lvl 28 Barya. Now I kill Balbala and it won't show on the Desert Map. Unable to get there or enter in someone's party. Have higher level Baryas and nothing.
I keep running Balbala and no drop. I got the lvl 52 and still can't get to the Trials. Won't populate on map.