I have purchased a certificate from digicert, but cannot seem to figure out how to install it on the UAG. They offer the certs in .cer or a single .pem file. I guess I am confused on what to upload for the private key file.
Any tips/ hints are appreciated.
When you created the CSR request, you should have created a private key at the same time. You need to upload that private key along with the files from digicert.
If you created the CSR using Windows then it is in the certificate store. In this case, you need to import the digicert key in the certificate store then export the certificate with "Yes, export the private key" selected.