I am no expert on this but I think the way the site is coded has something to do with the problem.
From site source code line 221:
"https://www.youtube.com/embed/4ZYouPgbnqM "
The item has an extra blank prior to closing quote.
Embed code from MS Edge:
<iframe width="560" height="315" src="https://www.youtube.com/embed/4ZYouPgbnqM" frameborder="0" allowfullscreen></iframe>
When I put the
https://www.youtube.com/embed/4ZYouPgbnqM into KM it will play the video.