Just Between Us

It wasn't immediately obvious at first, but after you fly with Moratari to Karsus Landing, go back to the Infinite Bazaar and you can talk to Eternus with this dialogue option: (Quest) How did Dalaran come to be on the Broken Isles?

And then say: Yes, take me back to how this all started.

You will then receive (Alliance) Legion: The Legion Returns / (Horde) Legion: The Legion Returns. Do this questchain.

You'll return to your main capital (SW or Org), do the Broken Shore scenario, the small follow-up questline in your main capital, and then witness the teleportation of Dalaran in (Alliance) In The Blink of an Eye / (Horde) In The Blink of an Eye . Talk to Emissary Auldridge in Dalaran to get your hearthstone and THEN your order hall NPC should appear in Dalaran trying to follow you around after waiting minute or 2 after (This might depend on the class you are playing though)

Do your order hall NPC's questline and do the quest for artifact you picked. Every class is a little different. After you complete that and retrieve the 'artifact', use the Curious Simulacrum and "Just Between Us" should be complete!

Now you should have the zone campaigns/Scouting Map.

I went embarrassingly long without completing this quest because it wasn't clear what to do and the quests are out of order from the original launch iirc. (e.i. In timerunning we get our artifacts before we do the broken shore scenario, so I just assumed that part was cut out)

Edit: Demon Hunters don't do the Broken Shore scenario! This class gets brought in AFTER the events of the Broken Shore.

If your like me and did all the artifact quests first and stuck with this quest in your log this might help you.
--Check to see if you actually have all 4 artifact weapons, I was missing the guardian artifact.
-If that's the case, check the map in Grizzly Hills, there should be a quest in the cave/tree trunk, talk to the bear god guy.
-This will finish your issues if you were stuck at this point.
Other weapons should have a similar problem with a quest else ware, I don't think this quest was auto given and may have been overlooked by a lot of players like me.

All you need to do, is your Order Hall Quest for your class. For example, the Demon Hunter's "The Hunt" questline.