Hello,
I apologize for the issue you are facing with connecting Rank Math to your site. It sounds frustrating, and we appreciate you bringing this to our attention.
To resolve the connection issue, please follow these steps:
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Ensure You Are Using the Latest Version of Rank Math: Make sure that you have the latest version of the Rank Math plugin installed. You can check for updates in your WordPress admin area.
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Check Site URL Settings: Navigate to WordPress Dashboard → Settings → General and ensure that both the WordPress URL and Site URL are the same. If they do not match, it can cause connection issues.

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Disconnect and Reconnect Your Account: If the URLs are correct, try disconnecting your Rank Math account and then reconnecting it. You can do this by following the instructions in the No Connected Websites Found guide.
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Clear Cache: If you still encounter issues, clear your browser cache, website cache, and any site-level cache before attempting to reconnect.
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Add a Filter (if necessary): If the problem persists, you can add a filter to your website to bypass the URL check. You can refer to our guide on adding filters for more details. Here’s the code you would need to add:
/**
* Filter whether we need to check for URL mismatch or not.
*/
add_filter( 'rank_math/registration/do_url_check', '__return_false' );
If you continue to experience difficulties after trying these steps, 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, and we hope to resolve this issue for you soon!
Sources:
How to Fix Problems While Connecting Account Using Rank Math » Rank Math
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.
Please head over to WordPress Dashboard > Settings > General and make sure there are no mismatches in the WordPress URL and Site URL in those options.

After that, please try disconnecting and reconnecting your Rank Math account to see if this resolves your issue.
If the issue persists, then we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
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.