Hi,
I'm not sure if it is the cause of Create Certificate Binding error. You may need the following to configure SSL on SQL Server Reporting Services.
1.Make sure the Wildcard Certificate contains the private key.
2.Make sure the URL is correct in rsreportserver.config file. The value should be the fully qualified path to your report server, with a hostname that is valid for your certificate.
3.Ensure the CA certificate has been installed in the trusted root for the local computer.
You can refer to Configure SSRS with an SSL Certificate.
If The certificate doesn't contains the private key, please export the certificate with private keys on the machine where generated the initial CSR in IIS. Here is link.
Hope this help.
Regards,
Joy