Did Not Loot Titan Prison Fragment for Quest Disturbance Detected: Ulduar

Disturbance Detected: Ulduar will be automatically marked as complete for you as soon as you kill Yogg-Saron in the Timewalking version of Ulduar during the Wrath of the Lich King Timewalking event. You cannot complete this quest outside Timewalking mode.

If you forgot to pick up the quest before killing the boss, you can simply pick up the quest and repeat the encounter. Customer Support does not grant quest credit.

You must turn in the quest during the Timewalking event. If the event has ended and you still have the quest with you, you can keep it for the next iteration of the Timewalking event. Check the in-game calendar to see when the next event will happen.