Access is Denied - Certreq.exe

I am getting an "access is denied" message when attempting to use the certreq from the commandline.

TLDR; I am a domain admin, and a local admin on the machine (inherited). I am using an elevated session of the command prompt. I have searched the internet, and seemingly the only thing helpful was to make sure that admins have full control over C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys.

I did that, and I am still getting permission denied, even after a reboot.