Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
There are some reasons behind why Google might not be able to determine the prominent video on your page, like:
1. Your video is not immediately visible on your page, and your visitors need to scroll down to see it.
2. The size of your video is too small.
According to Google, this could be caused by rendering issues in Googlebot, so you might not be able to fix it, but you should ensure that the video is reasonably prominent on your page.
For troubleshooting, please use the URL Inspection tool and click Test live URL > View tested page > Screenshot. If the video is outside of the initial screen position, you’ll need to try another test method.
Here’s a link you can follow for more information on this issue:
https://support.google.com/webmasters/answer/9495631?hl=en#indexing_status
Hope that helps and please don’t hesitate to let us know if you have any other questions.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.