When I click on the Missions tab on the console, I receive an opaque dark grey screen with the following message:
The MISSIONS screen is accessible only by the owner of this application. You can see your own missions for the applications you created or if the ownership is transferred to you.
I cannot click anything behind the screen. I am the only users associated with the account.
What is the application ID of the app?
You can also create another app and start the Missions there. The missions system is attached to the developer account and not to a specific app.