How? Using an alternate account with Powershell DSC Package Resource and Credential Parameter

I'm attempting to install SCCM2012R2 (among other things) as the local Administrator account using the below Powershell DSC script.

Would someone mind giving me a good working example, or better yet, modify my script if possible?

With the script the way it is, setup begins but the install log file states

 "INFO: ConfigMgr2012 Setup was started by NT AUTHORITY\SYSTEM."

 If I start setup manually with the administrator account it would state that the setup was started as MCG\ADMINISTRATOR
 So it works manually. I just can't get the script to do it.

 Thank you in advance

$ConfigurationData = @{
    AllNodes = @(
        @{
            NodeName="*"
            PSDscAllowPlainTextPassword=$true
         }
         @{
            NodeName="SERVER"
            PSDscAllowPlainTextPassword=$true
         }

    )
}

Configuration InstallSCCMTest {
    Param
    (
        [PSCredential]$Credential
    )
    Node SERVER
    {
        Package InstallSCCM
        {
            Ensure = "Present"
            Name = "SCCM 2012 R2"
            Credential = $Credential
            Path = "D:\SC2012_SP1_RTM_SCCM_SCEP\SMSSETUP\BIN\X64\setup.exe"
            Arguments = "/script c:\ccmscript.ini"
            ProductId = "00000000-0000-0000-0000-000000000000" #Not the correct ProductID but works for installation
        }
    }
}
InstallSCCMTest -OutputPath $PSScriptRoot\InstallSCCMTest -Credential (Get-Credential) -ConfigurationData $ConfigurationData
Start-DscConfiguration -Path "$PSScriptRoot\InstallSCCMTest" -Wait -Verbose -Force