was helping a friend with error153 for youtube. you need to add this header to the embedded iframe referrerpolicy="strict-origin-when-cross-origin"
you can get a full iframe output from any video by hitting share -> embed -> tick "enable privacy-enhanced mode". this gives you an alternate youtube domain, youtube-nocookie.com. here's an example
<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/_QccgKS4b58?si=QYOqkRf37GfTzjl6" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>.
looks like null previously added a custom embed for Kick so modifying the youtube embed for this shouldn't be too difficult. maybe.