Hello. You must have a full fireteam for this triumph to trigger. Unfortunately it cannot be triggered when doing it solo.
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It was done with a fireteam of 6 actually, 1 of my friend got the triumph about 2 hours later, the rest did not get it
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That’s odd. I was able to get it yesterday when a full fireteam was made. I would recommend to try again. I haven’t seen any reports of this being bugged besides the flawless triumph being bugged possibly.