Query SCCM site server remote registry for the currently logged on user account

Get-SiteServerCurrentUser.ps1

function Get-SiteServerCurrentUser {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$true)]
        [string]$ComputerName,
    
        [Parameter(Mandatory=$false)]
        [string]$SubKeyPath = "SOFTWARE\Microsoft\SMS\CurrentUser"
    )

    # Access the remote registry
    try {
        # Connect to the remote registry's LocalMachine hive
        $reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $ComputerName)

        # Open the target subkey
        $key = $reg.OpenSubKey($SubKeyPath)

        if ($key) {
            # Get all value names in the subkey
            $valueNames = $key.GetValueNames()
        
            if ($valueNames.Count -eq 0) {
                Write-Output "`nNo values found in the subkey"
            }
            else {
                Write-Output "`nValues in ${subKeyPath}:"
                foreach ($valueName in $valueNames) {
                    $value = $key.GetValue($valueName)
                    # If value name is empty, it's the default value
                    $displayName = if ($valueName -eq '') {'(Default)'} else {$valueName}
                    Write-Output "  $displayName : $value"
                }
            }

            # Close the key
            $key.Close()
        }
        else {
            Write-Output "Registry key '$SubKey' does not exist on ${ComputerName}."
        }

        # Close the registry connection
        $reg.Close()
    }
    catch {
        Write-Output "Failed to access registry on ${ComputerName}. Error: $_"
    }
}

# Example
# Get-SiteServerCurrentUser -ComputerName ps1-pss