I'm talking about the certificate at the web interface.
More over, I'm trying to "Manage the certificate". I click on "Generate CSR". Enter the name of the MobileIron MDM that is resolvable by the DNS, copy the contents from "----START CERTIFICATE REQUEST" to "---END CERTIFICATE REQUEST".
I copy whatever is in between, go to my CA, paste the contents, set the template as Web Server, and download a Base64 cer file. I then select upload certificate on the MDM, for "Portal HTTPS" (this is where I generated the CSR", and after the upload, I get the error that "Error: No keys found in input file".