I am configuring MDM for Avast Managed Workplace and am trying to get the APNS cert from Apple. I have downloaded my csr.txt key from my administration/mdm panel in the application, but when I try to upload it to the Apple Portal I get that error. I imagine this application is giving me a good key to use...
Invalid Certificate Signing Request
The Certificate Signing Request you entered appears to be invalid. Make sure that request file uploaded is in the correct format and not empty.