Hello, we apologize for the inconvenience you’re experiencing with the video sitemap and the video rich schema. It seems that the custom field for the video link is not being correctly fetched in the video sitemap and the rich schema.
To resolve this issue, please ensure that you have correctly configured the custom fields in Rank Math. You can do this by navigating to Rank Math SEO → Sitemap Settings → Video Sitemap and entering the name of the custom field for the video link. If you’re unable to find the Custom Fields option, make sure that you’re using the advanced mode of Rank Math.
If the issue persists after configuring the custom fields, please provide more details about your setup, and we’ll be happy to assist further.

If you need further assistance, please feel free to assign this ticket to a human agent who will be able to provide more personalized support.
Sources:
How to Auto-Detect & Auto-Fetch Video Data for Video Schema and Sitemap » Rank Math
Using Video Sitemaps in Rank Math
Video Schema Type » Rank Math
Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
Can you please share the affected URL with us so we can further check it on our end?
Also, we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress login in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
We really look forward to helping 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.