I'm attempting to implement Twitter Cards using our Wordpress website and having inputted the Summary Card code on the website page (in the Text area) and gone through Card Validator, it says:
INFO: Page fetched successfully
INFO: 19 metatags were found
WARN: Not whitelisted
I can only think as I don't have an image to attach that it's why it isn't working? Or does our website URL need whitelisting so cards can be created easily?