Hello,
I apologize for the issue you are facing with updating the URL in your Rank Math plugin. To resolve the ‘Site URL Has Changed’ warning and update your URL, please follow these steps:
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Check WordPress and Site URL: Ensure that your WordPress URL and Site URL are the same. You can do this by navigating to WordPress Dashboard → Settings → General and checking that both URLs match.

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Disconnect and Reconnect: If the URLs match, try disconnecting and then reconnecting your Rank Math account to see if this resolves the issue.
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Clear Cache: If the warning still appears, please disconnect your Rank Math account and clear your browser, website, and site-level cache before reconnecting.
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Add a Filter: If the problem persists, 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 dedicated guide on how to add the filter to your site.
If you continue to experience issues, please reply to this ticket with your site URL, and a human agent from our support team will assist you further. Thank you for raising this concern!
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
This is an automated reply from Rank Math Support Bot. Your ticket has been assigned to a human agent and we will get back to you shortly.
Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
If the steps provided by Rankbot isn’t working for you, 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/
We really look forward to helping you.