Hello,
We apologize for the issue your client is facing with the Rank Math SEO registration data on the WooCommerce Products Page. This error typically occurs when there is a problem with the connection between the website and the Rank Math account.
Here are a few steps you can suggest to your client to resolve this issue:
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Check Account Connection: Ensure that the website is connected to the correct Rank Math account, preferably one that has a PRO license. Your client can verify this by logging into their Rank Math account and checking the Websites tab.

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Reconnect Account: If the account is connected but still showing the error, they should try disconnecting and then reconnecting their Rank Math account. This can be done by navigating to Rank Math SEO → Dashboard → Help and clicking on Disconnect Account.

After disconnecting, they can click on Connect Now to reconnect.

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Clear Cache: If the issue persists, it may help to clear any browser, website, and site-level cache before attempting to reconnect again.
If these steps do not resolve the issue, please have your client reply to this ticket with their site URL so that a human agent from our support team can assist further.
Thank you for bringing this concern to our attention!
Sources:
What to Do When Rank Math Analytics Shows Zero Search Traffic » 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.