Hello,
We apologize for the issue you are facing with the 429 error while using the Instant Indexing feature on your new website. The HTTP 429 response code means "Too Many Requests," indicating that your IP address has sent too many requests to the IndexNow API within a short period.
To resolve this issue, you can follow these steps:
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Stop Submitting URLs Temporarily: You should pause submitting your URLs to the IndexNow API for a while. This will help in resetting the request count.
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Disable Auto-Submission: To stop automatic submissions, navigate to Rank Math SEO → Instant Indexing → Settings in your WordPress dashboard. In the Auto-Submit Post Types setting, click the Select / Deselect All button until the Posts, Media, and Pages options are unchecked.

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Change Your API Key: If the issue persists, consider changing your API key. Click on Change Key, then scroll down and click on the Save Changes button.

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Clear Your Website Cache: After making these changes, clear your website cache and wait for a few hours before trying to submit another URL again.
If you are on shared hosting, it’s possible that other websites on the same server are also using up the quota assigned to your shared IP address. In such cases, you may need to wait it out or contact your hosting provider for assistance.
If you continue to experience issues, please reply to this ticket with your website URL so that a human agent can assist you further.
Thank you for raising this concern, and we hope this helps resolve your issue!
Sources:
How to Fix 429 Error with IndexNow API » Rank Math
This is an automated reply from Rank Math Support Bot. Your ticket has been assigned to a human agent and we will get back to you shortly.
Hello,
Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
This is common with websites on a shared hosting server, so you can get in touch with your hosting provider to clarify this issue.
Here’s a link for more information: https://rankmath.com/kb/how-to-fix-429-error-with-indexnow-api/
Also, please note that if you have automatic submissions set for any post type, each time you save an edit to a post inside that post type, it will trigger a submission.
This might cause a high number of submissions if you are constantly making changes and saving them. If they are checked/enabled, then disable them.
Let us know how it goes. Looking forward to helping you.
Thank you.