Hello,
I’m sorry to hear that you are still facing issues with the SEO analyzer even after following the steps to whitelist Rank Math in Cloudflare. It seems like you have correctly set up the rules in Cloudflare, but the issue persists.
Since you have already whitelisted the necessary IP addresses and set up the Page Rules and Custom Rules in Cloudflare as per our guide, and you are still encountering the 400 error, there might be another reason causing this issue.
To further investigate and resolve this matter, I recommend replying to your existing ticket with this additional information. Our support team will review your case and provide you with further assistance to troubleshoot and resolve the problem.
If you need any further help or have any other questions, please feel free to reply to your ticket, and our team will assist you promptly.
Thank you for your understanding and patience.
Sources:
How to Whitelist Rank Math in Cloudflare » Rank Math
Why Am I Getting "API Error: HTTP 400" Error » Rank Math
Hello,
Thank you for contacting us and sorry for any inconvenience that this issue might have caused.
We are able to analyze your site’s SEO using our external SEO Analyzer: https://rankmath.com/tools/seo-analyzer/

Please head over to your WordPress Dashboard > Rank Math > Status & Tools > Database Tools and click on the Clear SEO Analyzer button to flush SEO Analyzer data.
Once done, clear your website and any server-level caching on your site before doing the Sitewide analysis again.
Let us know how this goes. Also, let us know if you have further questions or concerns.
Thank you.
Hello,
We’ve already replied to your other ticket on this issue. Please refer to this ticket:
https://support.rankmath.com/ticket/seo-analyzer-generates-400-error/?view=all
We are closing this ticket to avoid duplicate replies.
Looking forward to helping you there.