Hi,
I am also having issues with trying to implement Twitter cards for my company’s account.
Our site is running on Wordpress, and I’m using the Yoast SEO plugin to implement the appropriate markup.
The issue I’m having is that some pages will validate using the validator tool, whereas others are getting the WARN: Not whitelisted error.
Having checked the source code on a number of pages I can’t see any differences in the markup so am at a loss as to why this is the case.
Happy to provide sample URLs if required.
Any help or insight would be appreciated, thank you.