Push your Edge certificate to the Staging network
The certificate used for the end user to Edge server connection must exist in the Akamai staging network to test your HTTPS connections.
By default, when you create a certificate in the Certificate Provisioning System (CPS), that certificate is automatically deployed to the Akamai production network. To test it, you need to push it to the staging network, that is specifically set up for testing. This is done in CPS, and is fully covered in Certificate Provisioning System user docs.