I’m having the exact same problem on the alwaysreadthemanual.com domain, I’ve also contacted Media Temple and got the same reply, which was a bit frustrating.
@rchoi: Any chance you could approve that manually? I have an actual working URL in that domain with Twitter Card meta tags but would prefer to not share it publicly as we’re preparing it for launch.
Also, @rchoi, you mentioned in another discussion that some people had success contacting Media Temple. Do you know if they were provided with any solution? Because me and @ifiamblue didn’t have as much luck.