This is the Bug Report forum so I don’t believe Support posters will come here. It sounds like you’re missing “The Legion Returns” and “In the Blink of an Eye”, the latter of which gives the Dalaran Hearthstone item and gets you on the proper phase to start the artifact and class hall campaign. You can try checking your minimap tracking to see if tracking “Trivial Quests” will help. If that doesn’t sort it out, you might need to open a ticket to see if a Game Master can try to fix it (especially if “In the Blink of an Eye” wasn’t completed).