How to change the cert pem to pfx?

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?

https://www.google.com/search?client=ms-android-xiaomi-rev2&sxsrf=ACYBGNSuiFxvdoI0V5HW9D6O1WTLfZ-Ccw:1568808851269&q=convert+pem+pfx&spell=1&sa=X&ved=2ahUKEwiyirOyrNrkAhVNalAKHY6XDGYQBSgAegQIDBAC&biw=424&bih=720

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