Quest chain broken?

I have a problem with Azsuna versus Azshara quest chain. What happens is that I can't find what quest I completed, and there's no addon for this. If I can't complete this chain quest, and I'm not gonna be able to fly in legion.
Here's the chain: https://www.wowhead.com/achievement=...atata#comments on the first comment there's a table. If you can tell what I can do. I met all this NPCs in their places and I can't find the quest giver that corresponds to that part of the quest chain.

My character is called Nightavril and it's in the realm x4, Legion.