Hello,
I apologize for the issue you are facing with the API Error: HTTP 400 while using Rank Math’s SEO analyzer. This error typically indicates that the server cannot process your API request due to a client error. Here are some common reasons and potential fixes:
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Website Under Maintenance: Ensure your website is not in maintenance mode. If it is, switch it back to normal mode.

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Check Website Status: Verify that your website is returning a 200 status code. You can check the status of your website here.

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API Timeout: If your website takes more than 30 seconds to load, it may result in a timeout error.
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API Requests Blocked by Firewall: Ensure that your server’s firewall is not blocking our API requests. You may need to whitelist the IP 46.30.211.100
and the user-agent RankMathApi/2.0.2; https://rankmath.com
.
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Locally Hosted Website: The SEO Analyzer only works on live sites that return a 200 OK status when crawled from an external site. If your site is hosted locally, the SEO Analyzer will not function properly.

If you suspect that you entered the wrong property ID during setup, please ensure that you have the correct Google Analytics or Search Console property linked. Unfortunately, if the field is not editable, you may need to disconnect and reconnect the service to input the correct property ID.
If these steps do not resolve your issue, please reply to this ticket with your site URL so that a human agent from our support team can assist you further. Thank you for raising this concern, and we appreciate your patience as we work to resolve it!
Like I said, the bot is useless. I’ll delete Rank Math until a human can help me sort this out. This is not a good start.
Hello,
Please share your website URL so we can check as well.
The steps our bot suggested above are the guide to fix the 400 error in the SEO Analyzer tool.
Regarding the Google connection, lease verify using the URL prefix and ensure that you have verified the correct version of your website on the Google Search Console (HTTP or HTTPS, www or non-www).

You can follow our guide here to create the URL Prefix property:
https://rankmath.com/kb/google-site-verification/#num-1-1-open-google-search-console
The URL-prefix property also helps keep your sitemap in sync with Google Search Console as we submit it automatically for you. In addition, the domain property won’t work correctly on some sections of the Analytics module, such as the IndexStatus.
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.