Hello,
We apologize for the issue you are facing with the Instant Indexer. The 403 error indicates that the IndexNow API could not verify the ownership of the URL you submitted. This can happen for a few reasons:
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API Key Accessibility: Ensure that your API key is accessible to search engines. You can check this by clicking on the Check Key button available under the API Key location in Rank Math. If the key file is not accessible or returns a 404 error, it means the API key was not created correctly.


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Robots.txt Blocking: Make sure that the page where your API key is hosted is not blocked by your robots.txt file. This could prevent search engines from accessing it.
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Search Console Ownership: Verify that the email associated with your Rank Math account is indeed listed as an owner in Google Search Console for the domain in question.
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Cache Issues: Sometimes, caching can cause issues. Try clearing your website’s cache and then rechecking the API key accessibility.
If everything seems correct and you are still encountering this issue, it may be beneficial to reply to this ticket so a human agent from the Rank Math Support team can assist you further. Thank you for raising this concern!
Sources:
How to Fix 403 Forbidden Error with IndexNow » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
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.