Are you able to provide a video showing you completed the heroic event in the Hallows & no quest completed/continued?
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Ok. Did yall fully successfully complete it, or did the time limit (or vex sacrifice) reach the limit to auto-complete the event? If/when you run it again, try to get a recording of the event in case the quest doesn’t complete. That may provide useful insight on why it isn’t complete for you and/or provide Bungie info if bugged.