I completed 2 Nightfalls last night on Legend (1300) difficulty with clan mates with a score over 100,000 each time, and it did not show in the Destiny 2 app as having been completed. "Insight Terminus" Nightfall.
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[quote]I completed 2 Nightfalls last night on Legend (1300) difficulty with clan mates with a score over 100,000 each time, and it did not show in the Destiny 2 app as having been completed. "Insight Terminus" Nightfall.[/quote] The NF this week is Proving Grounds. The NF last week was Arms Dealer. You will have to wait until Insight Terminus is the NF for that week to complete the triumph.