Are you trying to insert a YouTube link into the HTML builder for a video that was originally broadcast as a livestream (such as via Streamyard), but it's not working in the template builder? Chances are it's because it's a "live link" and there is an easy fix.
What is a live link?
YouTube has a couple of different URL formats - a standard format and a live format.
Live links have "/live/" in the middle of the URL and standard links have "watch?v="
How to fix the URL
You can do this manually by copying the code (this is what identifies your video to YouTube) that follows the last slash in /live/ and pasting it after this:
Alternatively, many AI tools like ChatGPT can do this for you easily with a prompt like "convert this url into a standard YouTube link: [your link here]"