Hall of Guardians Mage in BFA?

If you did not do artifact quest line during legion, how do you obtain the teleport: hall of the guardians (https://www.wowhead.com/spell=193759/teleport-hall-of-the-guardian)?

This is so I can start the quest line for the artifact weapon (Ebonchill) and therefore unlock the legion dungeons (Halls of Valor) etc.
Bump.
You should have a quest in Legion Dalaran that starts the class hall campaign.
I used the 110 boost on my mage, and I had the teleport in my spellbook.
But as @Grimgaraz said, the quest is available at Dalaran in The Broken Shore.
I am unable to find the quest giver in legion dalaran and I do not have the teleport spell.

Which is the correct NPC/beginning of quest line?

Thanks
https://www.google.com/search?client=opera&q=wow+first+quest+of+legion&sourceid=opera&ie=UTF-8&oe=UTF-8

https://www.wowhead.com/guides/starting-legion-questing