In the meantime, you can bypass the issue by abandoning and retaking the quest, this time collecting the fragments in a different order. The next time you enter Teeth of Sithis, collect the fragment in the western most section of the map first, before grabbing the others.
ZOS_SarahHecker wrote: »Hey there! We are aware of this issue and have a support article about it here. If you're stuck on the quest please follow these instructions until we can get a patch out for this.In the meantime, you can bypass the issue by abandoning and retaking the quest, this time collecting the fragments in a different order. The next time you enter Teeth of Sithis, collect the fragment in the western most section of the map first, before grabbing the others.
Thank you!