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I accidentally dismissed a Quest. How do I get it back?
In the event that you dismissed a Quest, or believe you did not receive a Quest an eligible character, all Destiny Quests can be retrieved from the Abandoned Quests kiosk. The Abandoned Quests kiosk can be found near the class Mentors in the Tower.
If none of these steps solved your problem, you may return to the help page to seek other answers.