Hello,
We apologize for the issue you are facing with your category pages and the persistent 404 errors. It sounds like there may be a few factors at play here.
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Permalink Structure: Since you mentioned that you tried saving the permalink settings without any modifications, it’s important to ensure that your permalink structure is set correctly. Sometimes, simply saving the settings can help refresh the permalinks. If you haven’t already, try changing the permalink structure to a different option, save it, and then switch it back to your desired structure and save again.
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Redirection Issues: If you had previously set up redirects or made changes in the Rank Math plugin, it’s possible that some redirects are still affecting your URLs. You can check the Redirection Manager in Rank Math to see if there are any active redirects that might be causing the 404 errors. If you find any unnecessary redirects, consider deleting them.
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404 Monitor: Utilize the 404 Monitor feature in Rank Math to identify which URLs are returning 404 errors. This can help you pinpoint if there are specific issues with certain posts or pages.
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Caching Issues: If you have a caching plugin installed, clear the cache to ensure that old data isn’t causing the problem.
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Check for Conflicts: Sometimes, other plugins or themes can conflict with Rank Math. Temporarily disable other plugins to see if the issue persists.
If after trying these steps you still encounter issues, we recommend replying to this ticket so a human agent from the Rank Math Support team can assist you further.
Thank you for raising this concern!
Hello,
Could you please confirm if you have set the permalinks to /%category%/%postname%/ in this field?

You may also share the affected URL in the sensitive data section by editing your first post so we can check

It is completely secure, and only our support staff has access to that section.
If you want to share images, you can upload screenshots using this tool and add the link here.
Meanwhile, if the previous URL (without a category) is not redirecting to the new permalink, then you may need to set the redirect manually for them.
Looking forward to helping you.
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.