Check your game history to make sure Glory Beyond was done on Legendary as there is a bug that will swap the difficulty to Brave. If it wasn't done on Legendary, you can rerun the mission by going to Portal -> Renegades -> Tharsis Outpost -> Renegade icon on the left under the 'Tharsis Outpost' text -> customize -> pick Glory Beyond that has -20 combatant delta. Once done, as long as the other 5 missions were done on Legendary, Sidle Up at the Cantina and you should get the exotic. You may need to restart your game for it to catch up.