@EMar exactly. You’re right there.
So the title and published date worked correctly because you referenced the full path to those variables:
{{ steps.trigger.event.snippet.publishTime }}
{{ steps.trigger.event.snippet.title }}
However, with the final line that should contain the YouTube video link, it needs to use the full path like the other to. Currently it is:
{{ event.snippet.url }}
But, the YouTube video URL is part of the steps.trigger event:
{{ steps.trigger.event.snippet.url }}