Hello,
Thank you for contacting Rank Math support, and sorry for the inconvenience this may have caused.
We checked your site and found that GoDaddy’s firewall is blocking Rank Math REST Routes that we use to update the data, which is most likely why you’re facing the issue.
Please check the screenshot below for your reference:

To resolve this issue, please try whitelisting the following Rank Math REST Routes that are being blocked on your firewall.
/wp-json/rankmath/v1/updateMeta
You may try following this link to learn how you can whitelist Rank Math REST Routes in GoDaddy Website Firewall: https://in.godaddy.com/help/allow-access-to-a-file-or-folder-that-shows-an-access-denied-security-warning-32305
Alternatively, you can share the image with your hosting company (GoDaddy) and ask them to whitelist the above Rank Math routes.
Learn more about troubleshooting this issue here: https://rankmath.com/kb/meta-data-not-saving/
We hope these steps help you solve the problem, and please do not hesitate to let us know if you need our assistance with anything else.
Thank you for choosing Rank Math.
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.