Unable to change from summary card to summary card with large image - who can help?



my website http://petervonstamm-travelblog.com/ is validated and the twitter cards validator shows me a summary card. Card validator says: *.petervonstamm-travelblog.com is whitelisted for summary card

I want to change my cards tosummary card with large image”. Therefor I have installed Yoast SEO, that puts the card HTML into the HEAD of my site. I have checked this and everything is fine, but it does not work.

I have tried Wordpress Plugins like JM Twitter Cards, and Twitter Cards Meta - Summary Card with Large Image as well, but it does not work.
Do I have to apply the new card from Twitter again?? And how / where can I do this??
Need your help, please.
Thank you,


It looks like your page now contains two sets of Twitter card tags - both for summary_large_image and summary. You’ll need to get rid of all of the references to the summary card.


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