Can not return to mission point "The star chamber"

I have been playing an imperial agent campaign. I have been playing solo and am very under leveled. I was able to beat hunter in the star cabal while I was level 42. However, I chose to fight the two sith lords after that. Being 8 levels below them each could not defeat them. I used my map to travel away from the fight after exiting the fight using a flash bomb. I gained 2 levels and wanted to try again at lvl 44. However at this point I no longer see the location on the map to be able to finish my class story. I have the mission tracked, but still no mission location. I checked the map to see if it just wasn't highlighting the location, but the location did not exist. I do not know how to return. Any help would be appreciated.