Hello,
We apologize for the inconvenience you’re experiencing. To resolve the issue with Google not being able to read the sitemap due to detecting “noindex” in the HTTP header of “X-Robots-Tag,” you can follow these steps:
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Open the page source of the URL that has been classified by this error and check whether the page’s header includes the “noindex” robots meta tag. Here’s an example of how it looks:

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If you confirm that the page includes a noindex meta tag, you need to identify if the page is marked with a noindex meta tag correctly or incorrectly.
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If your page URL is set to noindex correctly, but you’re still seeing this error, then it is likely Google hasn’t crawled your page/sitemap since the changes were made.
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Check if your website’s sitemap is accessible using a tool like httpstatus.io and ensure it is not throwing any errors. If your sitemap returns a 404 error, you can refer to our tutorial to fix this.
We hope these steps help you resolve the issue. If you have any further questions, feel free to ask.
Sources:
Using Rank Math’s ‘Quick Actions’ Admin Menu Item
How to Fix Submitted URL Marked ‘NoIndex’ Error » Rank Math
Why Google Hasn’t Indexed Your Post, Page, and/or Website? » Rank Math
Why GSC Shows “No Referring Sitemaps Detected”
No Information is Available for This Page » 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.