Unless you are trying to implement a Player card, your card does not need to be whitelisted or approved. The not whitelisted error message from the Validator is misleading, and almost certainly means that the tool cannot see or find any
twitter:card markup in your page.
Before posting here, please check the following:
- when you view the source of your page, the expected Twitter Cards meta tags are shown
- NB at a minimum, your page must contain at least a
twitter:card meta tag specifying a valid card type, or suitable OpenGraph fallback tags.
- if you execute
curl -A Twitterbot <url> at the command prompt, does your page still show the
twitter:card tags in the
<head> section of the page?
- is your site accessible by the
Twitterbot/1.0 user-agent? Are all the files (including image files) accessible to Twitterbot? you should check http://your-site-url/robots.txt and ensure that it allows access to our crawler.
- are you using a Wordpress (or other CMS/blogging platform) plugin? We provide our own official Wordpress plugin, but cannot easily provide support for those built by third parties. Check that the configuration includes all of the required tags.
- are you putting the top-level site URL into the Validator, or the specific URL where your markup is present? you'll need to make sure that you provide a link to where your Card markup is visible in the page.
- are you using a supported Card type? Product, Gallery and Photo cards were deprecated in mid-2015.
- if your image is not showing, is it accessible on a URL that is not blocked by your
robots.txt file? Does it conform to our size constraints? Are you using an absolute and full URL (including the http protocol piece), not a relative one?
There is much more Troubleshooting information on our Developer site.
If you are posting about an issue with Cards, please include a link to the publically-accessible URL where your Card markup is visible, or we will be unable to help you.