Hello,
We apologize for the issue you are facing with the x-robots-tag: noindex error. It sounds frustrating, especially after trying various solutions. Since you’ve already followed the troubleshooting steps and found that deactivating Rank Math resolves the issue, we recommend checking a few additional things:
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Search Engine Visibility: Ensure that the Search engine visibility option is unchecked in your WordPress settings. You can find this by navigating to Settings → Reading in your WordPress admin dashboard. If this option is checked, it can prevent search engines from indexing your site, even if Rank Math settings are correct.

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Rank Math Metabox: Check the Rank Math Metabox for the specific post or page that is being affected. Make sure that the robots meta tag is set to Index. You can do this by opening the post/page in the WordPress Editor and looking for the Rank Math SEO options.

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Plugin Conflicts: Since you mentioned testing other plugins, ensure that there are no other SEO-related plugins that might conflict with Rank Math. Sometimes, multiple SEO plugins can cause issues.
If these steps do not resolve the issue, we recommend replying to your ticket with any additional details or updates, including your site URL, so a human agent from our support team can assist you further. Thank you for your patience, and we appreciate you bringing this concern to our attention!
Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
Please refer to our answer here to address the same issue: https://support.rankmath.com/ticket/x-robots-tag-noindex/?view=all#post-1052807
Don’t hesitate to get in touch with us if you have any other questions.
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.