I'm attempting to configure Windows 10 1803 deployment to previous releases of Windows 10 via the Self Service Portal.

I'm using the following command as a software deployment

"\\DNSDomainName.local\DC Repository\Microsoft\Windows\10\1803\x64\Setup.exe" /ReflectDrivers "%programfiles%\McAfee\Endpoint Encryption\OSUpgrade" /auto upgrade /DynamicUpdate disable

This command works fine manually but not via the Self Service Portal. Any ideas why. I just get a generic Windows Update warning '0x80070003 - 0x40003'