Just ran Prophecy in a fireteam of 3. I never died. The triumph did not pop. My stat tracker also shows 0 flawless runs. Attached a dungeon report image link for proof. Didn't see this as a known issue.
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Edited by Menphis Geo: 3/7/2021 9:50:08 PMSame thing but others got it on my team and I didn't.