I paid for pro, but it doesn’t link.

Hello,

We apologize for the inconvenience you’re experiencing with linking your email to your Rank Math PRO account. To resolve this issue, please submit a ticket to our support team with the details you’ve provided, including the email address you want to link to your PRO account and the billing screenshot. You can do this by navigating to the Rank Math Support Forum and following the instructions provided in the context.

Once you’ve submitted the ticket with the necessary details, our support team will locate your PRO account and change the email connected to it as requested.

Thank you for reaching out to us, and we appreciate your patience as we work to resolve this issue for you.

Sources:
I Purchased Rank Math PRO but Rank Math is Still Showing FREE » Rank Math
How to Change or Update the Payment Method » Rank Math
Where Is My Rank Math PRO License Key?