Video isn't authorized

Working here: http://yunfuxuexiao.net/%E8%A7%86%E9%A2%91%E5%AD%95%E6%9C%9F-pregnancy-videos/

Under second plus sign on the left I have a video embedded.

I get this error:
This video isn’t authorized to be embedded here.

What could be the problem?

Greetings,
Jonathan

https://wordpress.org/plugins/wistia-wordpress-oembed-plugin/