Video Not Playing in Slideshow

thank you for the access
here is the situation :
1/ your video url does not work at all. If you want to play a video in the slideshow, the video must work
See the url, paste it in your browser and you will see that there is an error
2/ in your url you can see that you did not add the "autoplay" parameters as per the youtube documentation, then you video could not autoplay even if it worked

3/ I have then put one of my videos to show you that it works. Here is the url that I use : now you can go on your website, enabe the autoplay in your browser and check the result

4/ in your email

I just did a speedtest on it at gtmetrix and it's loading super slow, so sorry about that. When I looked at the waterfall I see tons of red in regard to YT:

there is nothing related to Slideshow CK here, if you decide to load a Youtube video on your websitte, then of course you will load all the assets from it
if you have a problem with the Youtube performance, you shall ask Google

CEd

Thanks for sorting that out. I have no idea where I got that url from - I'll have to rewatch the live stream so see how I did that so I don't do it again.

After posting, I figured out the page load speed issue. I had the no password webauthn plugin published and right now that is killing J4.2.1's speed. It also doesn't help that I have a ridiculously large photo in that slide show - it was just one I used during the live stream.