Board Thread:Skyrim/@comment-122.59.207.147-20150628020615/@comment-6881629-20150628104545

If you look at the quests bugs list it says the "Retrieve Auriel's Bow" objective may not complete properly, a lot of problems with this quest an be cuased with dialog being skipped though quickly, on a PC you could try the command -

setstage DLC1VQ07 200

On a console reload and try again.