App Cards


I have a verified domain that has been approved for summary cards.
I have used the Card Validator and entered the URL where the App card Tags sits (a blank page with the correct Meta Tags) and it works, the App card is displayed in the preview and it shows our brand logo and name, our app summary, its Free, everything is correct.

However on the left I get the * not approved and the Request Pproval option is not selectable.

Can anyone tell me how to submit the App card for approval please ? Or provide a contact at twitter that can resolve this ?
Any assistance appreciated.