My related article (script rewritten as an essay) is timed to publish 15 minutes after my newest video is published on YouTube. If the problem is on the WordPress side, it might be because when I set up the embedded YouTube that the URL is not yet alive. As a workaround, I can add the embedded YouTube later.
Since YouTube is cracking down on external links in the video description, I dumped all the external links into the related article and post the link to the related article in my video description.
The related article does double duty by drawing traffic to my website and attention to the embedded video.