Hello,
I apologize for the issue you are facing with the 404 Monitor. It seems that the 404 Monitor module may not be enabled on your Rank Math setup. To ensure it is working correctly, please follow these steps:
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Enable the 404 Monitor Module: Go to Rank Math SEO → Dashboard and enable the 404 Monitor module. Make sure you are in Advanced Mode to access this feature.

-
Check the 404 Monitor: After enabling, navigate to Rank Math SEO → 404 Monitor from your WordPress dashboard. This is where you should see any recorded 404 errors.

If you still do not see any entries after testing URLs that do not exist, please reply to this ticket with your website URL so we can assist you further.
Regarding your second question about purchasing the PRO version, Rank Math offers a yearly subscription model rather than a monthly one. However, you can start with the free version and upgrade to PRO later when you’re ready.
Thank you for raising these concerns! If you have any more questions or need further assistance, feel free to ask.
Sources:
How to Monitor 404 Errors with Rank Math SEO Plugin
1. yes, i use it in advanced mode as below, and it is opened
2. in 404 monitor menu, there also has on list. my website is giantwe.com
3. OK, got. But the free score is used out.
I have installed what you said and checked my settings, everything is correct, but I still can’t see the 404 error list, why is that?
Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Can you please confirm if you’re not able to see any URLs in the Rank Math 404 monitor? If so, please head over to your WordPress Dashboard > Rank Math > Status & Tools > Database Tools and click the Recreate Missing Database Tables button and see if that works for you: https://rankmath.com/kb/rank-math-status-and-tools/#recreate-missing-database-tools
Please note that some options are only available when you enable the Advanced Mode in Rank Math. If Database Tools is not showing, please switch to the Advanced Mode: https://rankmath.com/kb/switch-from-easy-to-advanced-mode/
In case your theme is using a template for 404 pages, please use the following filter code on your website:
add_filter( 'rank_math/404_monitor/hook', function($hook ){
return 'template_redirect';
});
Here’s how you can add filter/hook to your WordPress site: https://rankmath.com/kb/wordpress-hooks-actions-filters/
Let us know how it goes. 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.