Does not work with my Divi theme

Good morning.

I have a wordpress site with Divi builder.
I would like to display a featured video instead of featured images. I followed the advice given on the Divi WebSite: https://www.elegantthemes.com/blog/tips-tricks/how-to-add-featured-videos-to-your-wordpress-posts-and-pages.
But it doesn’t work for me.
I send you the page where I did put the featured video.
https://agence-digitaline.fr/?p=4792
The featured video is the same one that is included in the page (without your plugin).
I put it in the page because I publish this article tomorrow and I needed to present this video. Too bad it’s not on the front page.
With your plugin, the only thing I see is the featured image that is generated by your plugin. No player in sight ??

And this is the link of the video: https://youtu.be/Hui6t-BdUxc

The page I need help with: [log in to see the link]