Invoke-command path null? - powershell

Question

I am working on this command to be able to view and edit a registry key remotely to a computer on a joined domain when I need to test something. In this case, I am looking at Excel's "vbawarninsg" key. This works just fine.
cls
$computername = Read-Host "Enter computer name..."
Invoke-Command -ComputerName $computername {Get-ItemProperty -Path 'REGISTRY::HKEY_USERS\xxxxxxx\Software\Policies\Microsoft\office\16.0\excel\security' } |
Select-Object PSComputerName, vbawarnings, PSParentPath | fl
$name = "vbawarnings"
The next part is to set a new value for the "vbawarnings" key using New-ItemProperty. When I assigned a variable for the -Path name it gives me an error "Cannot bind argument to parameter 'Path' because it is null."
This is the script that gives me an error
cls
$computername = Read-Host "Enter computer name..."
$registryPath = 'REGISTRY::HKEY_USERS\xxxxxxx\Software\Policies\Microsoft\office\16.0\excel\security'
Invoke-Command -ComputerName $computername {Get-ItemProperty -Path $registryPath } |
Select-Object PSComputerName, vbawarnings, PSParentPath | fl
$name = "vbawarnings"
$value = Read-Host "To modify...Enter a value"
New-ItemProperty -Path $registryPath -Name $name -Value $value `
-PropertyType DWORD -Force -Verbose | Out-Null
Any help is greatly appreciated!

Answer 1

In order to use a variable remotely (such as the case with Invoke-Command), you need to use the $using: variable scope:
Invoke-Command -ComputerName $cn {
Get-ItemProperty -Path $using:regPath
}
or pass it as a parameter:
Invoke-Command -ComputerName $cn {
param($path)
Get-ItemProperty -Path $path
} -ArgumentList '-path', $regPath
See this article

Answer 2

When you do Invoke-Command, that scriptblock gets sent to the remote server.
Invoke-Command -ComputerName $computername {Get-ItemProperty -Path $registryPath }
On the remote server, $registryPath is null even though you have it locally in your script.
So just hardcode the registry path instead:
Invoke-Command -ComputerName $computername {Get-ItemProperty -Path 'REGISTRY::HKEY_USERS\xxxxxxx\Software\Policies\Microsoft\office\16.0\excel\security' }