Before you can see here a correctly rendered FB or instagram post, you need to login to the CMS and add an oembed link.
We could not prepare it, because our oembed feature has been disabled. Therefore the new request.
Please execute the steps provided in the app review description.
Inside the cms: click "plus" sign above and choose "embed" and add an embed url. for example: https://www.instagram.com/p/COvkGSYAKXs/