Hello, I would like to report that on the triumphs section (the events tab to be precise), there is a persistent triumph notification that is imposible to remove, It was awarded for making a nightfall only by 2 players, it was done after crimson days, would be possible to remove the notification or the triumph for the people that didn't participated on the event.
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This is a known issue. There is nothing you can do on your end. You’ll just have to ignore it until Bungie releases a patch that fixes it.