I am having the same problem with trying to find Khadgar. I’ve done every quest in Legion I could, including the introduction and all of my class hall up to getting your title. I’ve also done TWW intro and pretty much everything else I could think of. I’m playing on a character I leveled during the Remix event.
On the map I am able to see the quests “Khadgar’s Discovery” and “A Falling Star” but the NPC is not there to interact with.
The ticket responses I received are AI generated for sure. They also indicated that this had been hotfixed but clearly tons of people are still having an issue. Hoping they address this one soon, it’s super frustrating to be gated out of so many quests and achievements. I just want the pretty feral forms 