I set up my Twitter cards using Yoast SEO but it is not working properly. One on post, it validates with image. One any other post it won’t validate. When I tweet, it does not pull a summary or picture for any other post.
I have several blogs. In this one, it pulls the summary but no photo:
In this one it does not pull anything:
It looks like these are now both pulling photos.
Sometimes we have cache delays; sorry about that.
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As a website owner you must opt-in to have cards displayed for your domain, and Twitter must approve the integration.