Is it possible to send an embedded contents via send an email V2 action in Power Automate?
You are referring to:
<iframe width="560" height="315" src="https://www.youtube.com/embed/Y7QcOUlcIyw?si=lqByz2G-m29zty_s" 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>
If so, Outlook does not support iframe.