I just did the night owl challenge and three people (one left after shuro chi) got the triumph, but three others (including me) don't have the triumph yet.
Link to PGCR:
https://www.bungie.net/en/PGCR/4313980164?character=2305843009301046670
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Hi DICE. Thanks for reaching out. Unfortunately, if you and some of the others didn't get the triumph, you'll have to try again until you do.