1.) Done by domain. May take 3 weeks, sometimes more. We are backed up on verifying them.
2.) Re: twitter:player, I would look at the source of any youtube video, and follow/click on the twitter:player link.
3.) If you’re only doing the twitter:player method, make sure the URL you specify is a.) full screen (as if it were in an IFRAME), b.) responsive, c.) does not auto play.
After you submit, we’ll get you feedback.