Hello,
Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.
Can you please share the affected URL with us so we can further check it on our end?
The thumbnailUrl is grabbed from your featured image. If you have not set a featured image, please do so from your post. Here is where it is located on Classic editor: https://i.rankmath.com/7q0EFy
If you do not need to use a featured image for this, you can directly add the image URL in the schema. Please see this screenshot: https://i.rankmath.com/MgikS6
We are looking 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.
