Azure – PowerShell script to use InvokeAzVMRunCommand on multiple VMs from foreach loop

I’m trying to get some information on this command I am trying to run.

Here is my script I’m attempting to run from an AzurePowerShell pipeline task…

param (
    [Parameter(Mandatory = $true)]
    [string[]] $vm_names = @("test-na01-vm004", "test-na01-vm005"),

    [Parameter(Mandatory = $true)]
    [string] $rg_name,

    [Parameter(Mandatory = $true)]
    [string] $env,

    [Parameter(Mandatory = $false)]
    [string] $client_secret,

    [Parameter(Mandatory = $false)]
    [string] $secret_name = 'my_secret'
)

try {
    # UTILITY FUNCTION IGNORE, USED FOR LOCAL TESTING ONLY.
    if (Test-Path "$($PSScriptRoot).env " -PathType Leaf) {
        Get-Content "$($PSScriptRoot).env " | foreach {
            $name, $value = $_.split('=')
            if ([string]::IsNullOrWhiteSpace($name) -or $name.Contains('#')) {
                continue
            }
            Set-Content env:$name $value
        }
    }

    if ($env:client_secret) {
        $client_secret = $env:client_secret
    }
    else {
        # The secret name needs to be made dynamic based on what environment this is being run against (This is where the $env variable will come into play)
        $client_secret = Get-AzKeyVaultSecret -VaultName "$($env)testna01kv001" -Name $secret_name -AsPlainText
    }

    foreach ($vm in $vm_names) {
        Write-Host "Preparing remote execution on $($env)-$($vm), from resource group: $rg_name. Environment: $env"
        $command = @{
            ResourceGroupName = $rg_name
            VMName = $($env)-$($vm)
            CommandId = 'RunPowerShellScript'
            ScriptPath = '.psregistration.ps1'
            Parameter = @{
                client_secret = $client_secret
            }
         }        
         Invoke-AzVMRunCommand @command
        }

What I am trying to figure out is my "$vm_names" parameter at the top of the script.

Everything seems to be working fine other than the foreach loop which is giving me the following error: "| Cannot process command because of one or more missing mandatory | parameters: vm_names."

In the foreach loop I have the VMName variable set to $($env)-$(vm). The $($env) is being passed in from the pipeline task via a runtime parameter i.e.

parameters:
  - name: environment
    displayName: Environment
    default: dev
    values:
      - dr
      - qa
      - uat
      - pd

variables:
  - name: resource_group
    ${{ if eq(parameters.environment, 'dev') }}:
      value: dv

          - task: AzurePowerShell@5
            displayName: "Execute Remote Registration"
            inputs:
              azureSubscription: "EnvConfig"
              ScriptType: "FilePath"
              ScriptPath: "$(System.DefaultWorkingDirectory)/ps/vm_run_command.ps1"
              ScriptArguments: '-env "${{ parameters.environment }}" -rg_name "${{ variables.resource_group }}-test-na01-rg001"'
              azurePowerShellVersion: LatestVersion

But the foreach loop is not picking up either of the vms from $vm_names
I want to be able to run this command on 2 specific VMs in any env (vm004 and vm005) but am having an issue with it not passing the parameter correctly.

I am still getting used to Stackoverflow so forgive me for any formating errors or missed information!

I’ve tried pretty much what is shown in my script other than formatting the command differently i.e.
Invoke-AzVMRunCommand -ResourceGroupName $rg_name -VMName $($env)-$($vm) -CommandId 'RunPowerShellScript' -ScriptPath '.psregistration.ps1' -Parameter @{client_secret = $client_secret

I can also run a specific VM in the command like -VMName dv-test-na01-vm004 and it will run correctly on that one machine.