Common ProblemsI get "do not meet requirements for scenario" although I finished the prior quest objectives.
First, open your map and ensure that the Legion Invasion is still active in Val'sharah. The event must be active to queue for the scenario.
Once you have confirmed it is active, try disabling any and all addons you have installed or perform a user interface reset. Then try and queue again.
We do not have the ability to grant quest completion or force the scenario to queue.