says you have not completed “Uniting Zulduzar”. Did you do that just today?
You do not need to finish the War Campaign, but according to that page, you have not done your 3 Footholds in KulTiras, which are reqired for your Flight Master’s Whistle.
Do you have your Flight Master’s Whistle in your bags? Did you get it today? Have you logged out and logged in again since you got it?