Hi, I’ve been trying to set up Twitter Cards but keep getting an Invalid Card Type when trying to validate and Apply.
I’m using WP SEO by Yoast and have activated the Twitter Cards in the social settings.
I’ve filled in all the required fields for the summary cards and every time I try to validate i’m told “invalid card type”. I get a preview on the Try Cards tab but when try to validate the preview isn’t displayed, just the message “unable to render card preview”.
Can anyone offer any advice please?