After installation of a wildcard SSL certificate into the certificate store, the certificate does not appear in the IIS certificate list for use with site bindings.
The Issue is the certificate request(CSR) was not generated from IIS. If you generated from Other sources e.g OpenSSL it will bring the issue. You need to generate the Certificate request(CSR) from IIS -> Create a certificate request, then enter all the details and then send to the vendor for regeneration of the SSL certificate. Mine worked properly after that.