Adding user to local group

PowerShell Help
1

Hello,

I am creating a PowerShell script that creates a local account and adds it to de local administrators group.
The creating of the account is succesvol, but the adding to the local group fails.
My code is as follows:

$rComputer = [ADSI]"WinNT://$sComputer,computer"
#$sLocalAdminUser = "Account"

# creating of the user account

# user account succesvol added
if($bAddUser -eq $True)
{
	# checking if user really exsists
	if([ADSI]::Exists("WinNT://$sComputer/$sLocalAdminUser,user")) {
		write-host "User exists, adding to local admin group"
		try {
			$rGroup = $rComputer.psbase.children.find("Administrators")
			$rGroup.Add(([ADSI]"WinNT://$sComputer/$sLocalAdminUser,user").path)
			$bAddGroup = $True
		} catch {
			write-host $_.Exception.Message
			$bAddGroup = $False
		}
	} else {
		write-host "User does not exist"
	}
}

The weird thing is, the user exists and the [ADSI]::Exists check verifies that the user exists.
But when I try to add the user to the localgroup it results in an error:
Exception calling “Add” with “1” argument(s): “A member could not be added to or removed from the local group because the member does not exist.”

When I first run the code for adding a new user and then manually use Powershell to add the user to the group it does work.

Can somebody tell me what’s wrong?

2

Just solved it:

if($bAddUser -eq $True)
{
	if([ADSI]::Exists("WinNT://$sComputer/$sLocalAdminUser,user")) {
		LogWrite -sLogString "WinNT://$sComputer/$sLocalAdminUser,user"
		LogWrite -sLogString "User exists, adding to local admin group"
		LogWrite -sLogString "WinNT://$sComputer/$sLocalAdminUser"
		try {
			$rGroup = [ADSI]"WinNT://$sComputer/Administrators,group"
			$rUser = [ADSI]"WinNT://$sComputer/$sLocalAdminUser,user"
			
			$rGroup.add($rUser.Path)
		} catch {
			LogWrite -sLogString $_.Exception.Message
			$bAddGroup = $False
		}
	} else {
		LogWrite -sLogString "User does not exist"
	}
}