my service is windows 2016,needs the cert as .pfx,but i creat the cert from "Origin Certificates
Generate a free TLS certificate signed by Cloudflare to install on your origin server.
Origin Certificates are only valid for encryption between Cloudflare and your origin server." it show the .pem
i change the cert with openssl but when i set it on my service the browser says the NET::ERR_CERT_AUTHORITY_INVALID
what shoule i do?