We're here to help. What's the URL you're trying to embed? To avoid it trying to automatically convert (so we can see the 'raw' URL) put inside of plain tags likeStill working on putting vid in, by the way.
[plain]https://www.youtube.com/watch?v=123456[/plain]
. If it's a 'good' YouTube URL but is not auto embedding then it's something for me to figure out.