C&P your codes here let me take a look, it should not be any problem, make sure you use iframe tags.
<div class="enhanceable_content tabs" >
<ul>
<li><a href="#fragment-1">One</a></li>
<li><a href="#fragment-2">Two</a></li>
<li><a href="#fragment-3">Three</a></li>
</ul>
<div id="fragment-1">Tab One: Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.<iframe width="560" height="315" src="https://www.youtube.com/embed/yajdlBZSw3Y" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></div>
<div id="fragment-2">Tab Two: Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</div>
<div id="fragment-3">Tab Three: Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</div>
</div>
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