Seems like your site URL has changed since you connected to Rank Math.

Hello,

We apologize for the issue you are facing with the error message stating that your site URL has changed since you connected to Rank Math. It seems you’ve already taken some good troubleshooting steps by disconnecting and reconnecting your Rank Math account and verifying that the WordPress URL and Site URL are the same in your general settings.

Here are a few additional steps you can try:

1. Clear Cache: Make sure to clear your browser cache, website cache, and any site-level cache plugins you might be using. This can sometimes resolve persistent issues.

2. Add a Filter: If the warning still shows up after clearing the cache, you can add the following filter to your website to bypass the URL check:

   /**
   * Filter whether we need to check for URL mismatch or not.
   */
   add_filter( 'rank_math/registration/do_url_check', '__return_false' );

   You can refer to our guide on adding filters to your site for more details.

3. Check for Plugin Conflicts: Sometimes other plugins can interfere with Rank Math. Try deactivating other plugins temporarily to see if that resolves the issue.

If you continue to experience this problem, 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 your patience!

Sources:
How to Fix Problems While Connecting Account Using Rank Math » Rank Math

Hello,

Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.

To solve the issue with your website not being connected properly to your Rank Math account, let’s start by checking your WordPress settings and making sure that your website URL is correct. Sometimes, a mismatch in the URL or a missing slash can mess up the connection.

To do this, please go to your WordPress dashboard and click on Settings > General. Then look at the WordPress Address (URL) and Site Address (URL) fields and see if they match your website URL exactly.

If you find any mismatches, please correct them and save the settings.

After that, please try disconnecting and reconnecting your Rank Math account to see if this resolves your issue.

If this doesn’t work, you can try adding a filter code to your website that will bypass the URL check. This might help if there is some issue with your server configuration or DNS settings. The filter code you need to add is below:

/**
 * Filter whether we need to check for URL mismatch or not.
 */
add_filter( 'rank_math/registration/do_url_check', '__return_false' );

To add the filter code, please follow this guide: https://rankmath.com/kb/wordpress-hooks-actions-filters/

And that’s it! ​​​​​​​The website should now be able to stay connected without any issues.

For more information on why this issue happens and how to fix it, you can check this page: https://rankmath.com/kb/problems-while-connecting-account/

We tried the login you provided however it lacks the admin credentials to check the above steps and to install a fress copy of both Rank Math SEO and Rank Math PRO plugins.

Can you please check on your end and let us know how it goes.

We really look forward to helping you. Thank you.