You might be in a raid group! We also have some other steps to fix this issue.
Troubleshooting steps for error "Game Initialization Failed" when launching a game
How to troubleshoot issues with starting this scenario if it will not allow you to queue.
Troubleshooting an issue where Malfurion will not allow access to Cenarius in the Emerald Nightmare.
Information on the World of Warcraft: Companion App
Error: An updated version of World of Warcraft is available.
What to do when you cannot loot the chest after the Rastakhan boss fight.
What to do if you can't find or start this quest.
Troubleshooting for the "Lost Connection to the Voice Chat Service" error message in World of Warcraft