Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
To fix the issue, please make sure the service account is listed as the Owner of the site in the Search Console.
You can follow the steps illustrated here to solve the issue:
https://rankmath.com/blog/google-indexing-api/#403-permission-denied
Once done, clear your website’s cache and check again.
Hope that helps.
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.