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 this, make sure the service account is listed as Owner for the site in Search Console.
Please follow the steps illustrated here to solve the issue: https://rankmath.com/blog/google-indexing-api/#num-6-2-403-permission-denied-failed-to-verify-the-url-ownership
This is one of the most common issues when setting up Instant Indexing.
Don’t hesitate to get in touch if you have any other questions.
Thank you.
I am listed as the owner.
Hello,
We might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress logins 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.
I tried again this morning and it’s working fine. Thanks
Hello,
Thank you for the update.
We are glad that this issue is already resolved.
If you have any other concerns, please don’t hesitate to contact us anytime to assist you further.
Looking forward to helping you.
Thank you.