I\'m facing an issue in installing SSL certificate in IIS and below are the step before I got the certificate from my CA.
Generated a private key file using
You did not generate the certificate request via IIS Manager. Thus, you should not use IIS to complete the request.
Instead, you need to use OpenSSL to generate a PFX file,
create a pfx file from a .cer and a .pem file
Then you can import it to IIS.
You might read this post for more details,
https://blog.lextudio.com/2015/06/the-whole-story-of-server-certificate-disappears-in-iis-77-588-510-0-after-installing-it-why/