Hello,
We apologize for the issue you are facing with the Instant Indexing plugin showing a 202 – Accepted status for an extended period. Thank you for providing the details regarding your verification steps.
The 202 status indicates that the IndexNow API has accepted your request, but it still needs to validate the API key to confirm that the URL belongs to your site. Here are a few additional steps you can take to troubleshoot this issue:
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Check API Key Location: Ensure that the API key is correctly placed and accessible. You can do this by clicking on the Check Key button in the Rank Math settings to verify that the API key is being served correctly.

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Review the History: Navigate to Rank Math SEO → Instant Indexing → History in your WordPress dashboard to check the response codes associated with your submitted URLs. If you see any other error codes (like 403 or 429), those may provide further insight into the issue.

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Manual API Key File: If the API key file is not accessible or if there are issues with it, consider manually creating a text file containing your API key in the root directory of your website.
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Wait for Validation: Sometimes, it may take a bit longer for the API to validate and change the status from 202 to 200, especially if there are high volumes of requests.
If you’ve checked all these aspects and the issue persists, please reply to this ticket with any additional details or errors you might be encountering, and a human agent from our support team will assist you further.
Thank you for your patience, and we hope to resolve this for you soon!
Sources:
How to Use IndexNow With Rank Math » Rank Math
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.