can't automate the authentication process with PowerShell on Linux

On Debian 11, I have installed PowerShell 7.3.0. I am testing if I can run commands on a remote Windows computer. This is a simple example to get the remote computer hostname.

#!/usr/bin/env pwsh

$username = "Administrator"
$password = "passgoeshere"
$secureStringPwd = $password | ConvertTo-SecureString -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential -ArgumentList $user, $secureStringPwd

Invoke-Command -ComputerName 192.168.xxx.xxx -Credential $cred -ScriptBlock { hostname }

My problem is that when I run this script, I still get a prompt to enter a username and password.

PowerShell credential request
Enter your credentials.
User:

It's not a problem with the credentials because when I enter them manually, it gives me the hostname of the remote computer.

I think it has something to do with the way PowerShell on Linux reads the credentials.

What can I do to get the script not to prompt for user/pass?

edit: the issue was a typo

Your script it's ok. Change variable $username to $user

I used "Invoke-VMSscript"

$user = "root"

$password = "P@ssword"

$secureStringPwd = $password | ConvertTo-SecureString -AsPlainText -Force

$cred = New-Object System.Management.Automation.PSCredential -ArgumentList $user, $secureStringPwd

Invoke-VMScript -VM My_VM -ScriptText "hostname" -GuestCredential $cred -ScriptType Bash

ScriptOutput
---------------------------------------------|  My_VM
|  
---------------------------------------------