Nostalrius Begins - Quality wow vanilla realm (1.12)

Greetings, I need some help here, I was doing this chain quest "Simple Request" which leads me to those 2 following quests: Sealed Azure Bag and Encoded Fragments, after completeing those 2 quests I'm supposed to get a 3rd quest called The Azure Key from the NPC called Archamge Xylem. And he doesn't give anymore quests. Any help would be much appreciated!

Best regards DrShen!

All of the lvl 50 class quests go up to the point where you are supposed to go to Sunken Temple, then that quest is missing. This is because that content is not in game yet, due to the progressive nature of this server.
Be patient and check back later, when you see a patch that changes a lot of the content.