You appear to have two level 55 mages that you recently logged into. Just for future reference, more specific information can help locate the character easier. level/class/realm, or name and realm. 
Those quests no longer start the same way, as the King is no longer with us. Grand Admiral Jes-Tereth should offer the quest, but she may be phased out.
From what I can see you started the Battle for Azeroth intro. I’d recommend completing “The Nation of Kul Tiras”, which you recently picked up.