Hello,
We apologize for the issue you are facing with connecting your Rank Math account and encountering a 404 error. This can happen if there is a mismatch in the site URL settings or if the URL has changed since you connected to Rank Math.
To resolve this issue, please check the following:
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Verify Site URL: Ensure that the site URL in your WordPress settings matches the URL you are trying to connect with. You can check this by going to WordPress Dashboard → Settings → General and confirming that the WordPress Address (URL) and Site Address (URL) fields are the same.

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Reconnect Rank Math: If the URLs are correct, try disconnecting and reconnecting your Rank Math account. This can sometimes resolve connection issues.
If you continue to experience problems, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further.
Thank you for bringing this to our attention!
Sources:
How to Fix Problems While Connecting Account Using Rank Math » Rank Math
Hello,
Thank you for contacting Rank Math support.
I tried visiting that URL on my end, and it was working fine.

Please try again on your end and let us know. If it still does not work, you can share access to your website with us so we can investigate further.
Thank you for your patience and cooperation
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.