Hello,
We apologize for the issue you are facing with your Rank Math account. It seems that when you attempted to connect your 4th website, the previous connections were lost. This can happen if the account is disconnected during the process.
To resolve this, please follow these steps:
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Disconnect Your Account: Go to Rank Math SEO → Dashboard → Help in your WordPress admin area and select Disconnect Account.

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Reconnect Your Account: After disconnecting, click on Connect Now to reconnect your Rank Math account. Make sure to select the correct account that has all your websites associated with it.

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Check Connected Websites: Once reconnected, you can verify your connected websites by visiting your Rank Math Account Area.

If you still do not see your previous websites after following these steps, please reply to this ticket with the URL of your sites, and a human agent from our support team will assist you further.
Thank you for bringing this to our attention, and we hope this helps resolve the issue!
Sources:
Website Not Shown In Rank Math Account Area » Rank Math
How to Get Rid of "No Connected Websites Found" Message » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
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.