Hello,
We apologize for the issue you are facing while trying to upgrade your subscription. The message you received typically indicates a problem with the payment process. Here are some troubleshooting steps you can follow:
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Select Your Current Location: Ensure that the country displayed in the dropdown menu at the top-right corner of the checkout page is correct. If it shows a different country, click on it and select the correct one.

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Turn Off Your VPN or Proxy: If you have a VPN or proxy server enabled, please turn it off. Some browsers also have built-in VPNs, so check your browser settings to ensure it’s disabled.

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Disable Ad Blockers: Make sure to turn off any ad blockers while attempting the transaction. Even if you did not install one, review your browser settings as some browsers come with built-in ad blockers.

If you have checked all of these and are still experiencing issues, please reply to this ticket with any additional details or a screencast of the issue, and a human agent from our team will assist you further.
Thank you for bringing this to our attention, and we look forward to helping you resolve this issue!
Sources:
Troubleshooting Payment Issues at Rank Math » Rank Math
Thanks Help Bot.
I tried all of those. Disabled VPN, made sure USA selected, & turned off ad blockers.
I still get the same message.
Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Could you please share the last 4 digits of your credit card in the sensitive data section so we can check why it isn’t working?
Looking forward to helping you.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
Your transaction triggered a security flag so we had to request that the transaction be whitelisted. We already sent the request so we are just waiting for the confirmation from our payment provider.
Thank you.
Hello,
Sorry for the delay and thank you for your patience.
Going back to this ticket, we have received word from our payment provider and your card has been whitelisted. Please go ahead and try initiating a purchase.
Let us know how that goes.
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.