Need Help with Scripts and open templates

Hello all, I am currently trying to get ARM to run a script that move the user to a specific OU and to add it to specific group when using an open template to terminate a user. I created the Open template using the ARM Template generator. the PS script I am trying to run is this: 

param(
    [string] $UserName,
    [string] $targetDate,
    
)

try {
    # Asegurarse de que el script se ejecute incluso sin salida en la consola
    $ProgressPreference = "SilentlyContinue"
    
    $session = New-Object Microsoft.PowerShell.Commands.WebRequestSession
    
    $loginUrl = $baseUrl + "/Session/loginWithToken?token=$authZToken"
    
    $result = Invoke-RestMethod -uri $loginUrl -Method Get -SessionVariable websession
    Write-Host "Logon Result: $result"
    if (!$result.Success) {
        exit 5
    }
    $cookies = $websession.Cookies.GetCookies($loginUrl)
    
    $session.Cookies.Add($cookies)
    
    #------------------------------------------------
    # Configuración inicial
    $ADUser = $accountDn
    $EmailGroup = "Mail group NAME"
    $ExcludeGroup = "MAIL GROUP TO EXCLUDE"
    $TargetOU = "OU=TargetOU,OU=Site,DC=fqm,DC=COM"
    
    # Función para agregar un usuario a un grupo
    function Add-UserToGroup {
        param(
            [string]$UserName,
            [string]$GroupName
        )
        $User = Get-ADUser $UserName
        if ($User.Email -ne $null) {
            Add-ADGroupMember -Identity $GroupName -Members $User
        }
    }
    
    # Función para remover un usuario de todos los grupos excepto uno
    function Remove-UserFromGroups {
        param(
            [string]$UserName,
            [string]$ExcludeGroupName
        )
        $User = Get-ADUser $UserName
        $User | Get-ADPrincipalGroupMembership | Where-Object {$_.Name -ne $ExcludeGroupName} | ForEach-Object {
            Remove-ADGroupMember -Identity $_ -Members $User -Confirm:$false
        }
    }
    
    # Función para limpiar el campo de manager de un usuario
    function Clear-UserManager {
        param(
            [string]$UserName
        )
        Set-ADUser $UserName -Manager $null
    }
    
    # Función para mover un usuario a una OU específica
    function Move-UserToOU {
        param(
            [string]$UserName,
            [string]$TargetOU
        )
        Move-ADObject -Identity $UserName -TargetPath $TargetOU
    }
    
    # Lógica principal
    Add-UserToGroup -UserName $ADUser -GroupName $EmailGroup
    Remove-UserFromGroups -UserName $ADUser -ExcludeGroupName $ExcludeGroup
    Clear-UserManager -UserName $ADUser
    Move-UserToOU -UserName $ADUser -TargetOU $TargetOU
   

I am not an expert on PowerShell either on coding so will appreciate if you can provide me help about how to make it works on ARM. I have been looking for tutorials but there is not enough information about it.  Any help will be fully appreciated. 

this is the code of the Open template: 

[
  {
    "Version": 1,
    "TemplateType": "OpenTemplate",
    "Id": "68421248-a1d7-4a02-972e-533412254cd5",
    "DisplayName": "User Termination",
    "Description": "Terminate all user access and disabled the account. ",
    "IsManualInteractionRequired": "False",
    "ScriptToExecute": "User Terminationv2",
    "Form": {
      "Type": "Container",
      "Label": "User Termination",
      "Templates": [
        {
          "Key": "SAMAccountName",
          "Value": {
            "Type": "AccountSearchTextField",
            "Label": "User ID",
            "Description": "Network user ID used to logon on FQML network",
            "LookupTableId": "",
            "IsRequired": true,
            "AttributesToLoad": [
              ""
            ]
          }
        },
        {
          "Key": "targetDate",
          "Value": {
            "Type": "DatePicker",
            "Label": "Date to be deactivated",
            "Description": "Please specify when the account needs to be terminated. ",
            "ScriptParameterFormat": "M"
          }
        }
      ]
    }
  }
]