Anduin not on throne, cannot turn in “An End to the Killing”

So I have researched and seen this has been going on for some time now (years) and yet still a problem…my luck. I was trying to get “Ready for War” achievement to unlock Dark Iron Dwarves. I literally only need to turn in “An End to the Killing” quest, but when I go to Stormwind Keep Anduin is not on the throne. I went back to Boralus and accept the quest from the owl to start the Dark Shores questline and have it completed up until the Warfront: Battle of DarkShores which I cannot do solo I’m guessing since I can not que into it from the war Table in Boralus. Please any help would be greatly appreciated. Newer player here, only been playing for a few weeks…