Missing field ‘thumbnailUrl’

Hello,

We apologize for the issue you are facing with the missing thumbnailUrl value in your schema. This error typically occurs when Google cannot find a valid thumbnail image for your video content on your webpage. Here are some steps you can take to resolve this issue:

1. Add a Featured Image: Ensure that you have set a featured image for your post or page. You can do this by navigating to the post or page editor, clicking the Settings/Sidebar icon, and then selecting Set featured image from the Featured Image section. This will automatically add the thumbnailUrl property to your Video Schema.
   

2. Custom Thumbnail via Video Schema: If you prefer to use a custom thumbnail instead of the featured image, you can add a custom thumbnail using Rank Math’s Video Schema. To do this:

   • Open the Rank Math Metabox by clicking the Rank Math icon in the top-right corner of the screen.
   • Click the Schema icon and navigate to the Video Schema.
   • In the Schema Builder, locate the VIDEO THUMBNAIL section and paste your video’s custom thumbnail image URL. Then click Save for this Post.
     

3. Validate Your Schema: After making these changes, you can validate your Schema to confirm that the thumbnailUrl error has been fixed. Navigate to the Schema in Use field and click the View icon, then test the code with Google using the Rich Result Test tool.
   

If you follow these steps and still encounter issues, please reply to this ticket, and a human agent from our support team will assist you further. Thank you for raising this concern!

Sources:
How to Fix Missing ThumbnailUrl Error in Schema Markup » Rank Math