KEY POINTS:
*Class order hall NPC’s to start your class questline in Dalaran do not exist following TWW pre-patch, so if your Level 70+ hasn’t started their Class Hall they can NOT START IT now. NOTE: timewalking with Chromie up to lvl 60 does work but as soon as you hit the level cap you’re phased into the current timeline where these NPCs no longer exist
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KHADGAR no longer exists in Dalaran interactively other than for the TWW pre-patch Harbinger questline, after this he remains purely to sit and listen to; he WILL NOT appear ANYWHERE else i.e. quest marker locations
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Crucial NPC’s to class order hall campaign quests DO NOT exist - they will not phase in even if you abandon and retake the quest nor if you restart the game
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COMPLETING THE HARBINGER QUEST DOES NOT BRING KHADGAR BACK IN ANY PHASE - For now it seems Khadgar’s interaction in TWW has removed him from all instances, whether you own TWW or not
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IF YOUR CHARACTER HAS ALREADY STARTED, the questlines are still available if they’re in your questlog, however some classes will be unable to get the achievement and therefore the class order hall mounts/weapons/armour due to missing NPCs from crucial questlines
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IMPORTANT! Sadly ROUGE classes still CAN NOT do any of their class hall due to invisible walls preventing progression in certain areas. This continues to be an ongoing issue
There is one thread we’ve found currently with a work around that seems up to date and several people have confirmed it working (linked below) HOWEVER this relies on you having bought TWW and either having friends or alt accounts that can link up with you and enable party sync in an attempt to phase these NPC’s back into the world.
Blizzard has replied as of today, 22 days ago, saying that these should be fixed as of TWW full release, however as of yet that hasn’t happened and this is the best solution we could find.
If you have any further info, or tips, tricks or just confirmation of the bug please do share your info so hopefully this can be resolved!