Earlier this week, I did the SotW dungeon with a friend, both of us using solar subclasses, but I didn't get the triumph while he did. Also, just today I completed it again with another friend, and even though they died a few times, I went flawless but didn't get the triumph. I looked at my Dungoen Report (link in description, don't know if it will go to my page) and it confirmed I had zero deaths. Is anyone else not getting triumph unlocks from the new dungeon?
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According to the dungeon report, your friend died three times during the dungeon. A flawless run, similar to raids, requires every member of the fireteam to stay alive for the entirety of the session, not just you.