Can't Turn in Quest - The Eternal Traveler

The quest The Eternal Traveler rewards Ensemble: Vestments of the Eternal Traveler. To pick up the quest, you must either own the Ensorcelled Everwyrm as part of the Heroic or Epic edition of Shadowlands, or be in range of someone who owns the mount and is sitting on the ground to interact with it. 

When you or someone near you is seated on the Ensorcelled Everwyrm, click on the interactive Guiding Orb on the back of the mount. This will summon Xolartios to either pick up the quest or turn it in once you have completed it.