So I was in progress of the quests to unlock the Dreaming City, but had to take a short break. When I came back a buddy of mine was doing his so I joined in the middle of the mission. By the time I had joined his fireteam and loaded in the mission had ended and we were returned to orbit, where I was still presented the option to go to the newly unlocked dreaming city. However, I am not able to collect any triumphs from the dreaming city on my console due to it saying the area has not been discovered. So now I am able to run around the Dreaming City, continuing on with my weekly and daily bounties, but unable to claim any triumphs I unlock along the way. I am able to see completed triumphs with my companion app so I can verify that the Dreaming City is this “undiscovered” location.