as a Service connecting remote WMI query errors out with wrong user

Ok, first of all here is the error message from WMI-Activity / Operational in EventLog (Windows 8):

Id = ; ClientMachine = machinename; User = machinename\Dev; ClientProcessId = 1440; Component = WMIService; Operation = connect to namespace : root\CIMV2\Security\MicrosoftVolumeEncryption; ResultCode = 0x80041003; PossibleCause = the user was not granted appropriate permission on the namespace.

the thing is User name "Dev" is not the username that I fed to the ConnectionOptions of ManagementScope() when I attempted connection to remote computer.

The machinename(I hide) was correct.

Trying to make a remote connection is a service and most suspicious scenario is service running as local machine somehow overwrites the username..

I need a confirmation with somebody who might know and able to explain what I am doing wrong here..

I see Username and Password are correct until fed into properties of ConnectionOptions and made Scope.Connect() call.