Embed of YouTube Videos in Popover

Dear plugin developer,
I try to have clickable videos for my layers.

Adding via Media-URL with the standard embed code won’t work at all: [embed]https://youtu.be/IfpE9fPQqnk[/embed]

When I add the Embed-Code from Youtube in text mode, like this:
<iframe width="560" height="315" src="https://www.youtube.com/embed/IfpE9fPQqnk" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
the preview works perfectly but the video won’t show on the frontend.

Is there a solution to this?

I can grant guest access if you want to have a look at the page (it is still in development).

Thanks for your support

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