Powershell Function to Get Auth Header based on UPN with Graph API

Get-GraphAuthHeaderBasedOnUPN.ps1

#You need AzureAD Module (Save-Module AzureAD -Path C:\temp)
#Azure DLL are sideloaded in a job to bypass potential conflict with other version
function Get-GraphAuthHeaderBasedOnUPN
{
	[cmdletbinding()]
	param(
    [Parameter(Mandatory = $True)]
      	[string]$Tenant = "",
    [Parameter(Mandatory = $false)]
      	[string]$clientId = "1950a258-227b-4e31-a9cf-717495945fc2",
    [Parameter(Mandatory = $false)]
      	[string]$redirectUri = "urn:ietf:wg:oauth:2.0:oob",
    [Parameter(Mandatory = $false)]
      	[string]$resourceAppIdURI = "https://graph.microsoft.com",
	[Parameter(Mandatory = $false)]
      	[string]$AzureADPowershellModuleDir = "C:\Temp\AzureAD",
    [Parameter(Mandatory = $True)]
      	[string]$UserPrincipalName = ""
	)
	#Requis de faire une job pour éviter les conflits de DLL avec EXO ADAL
	$job = Start-Job -ArgumentList $Tenant,$UserPrincipalName,$AzureADPowershellModuleDir,$clientId,$redirectUri,$resourceAppIdURI -ScriptBlock {
		$Tenant = $args[0]
		$UserPrincipalName = $args[1]
		$AzureADPowershellModuleDir = $args[2]
		$clientId = $args[3]
        $redirectUri = $args[4]
        $resourceAppIdURI = $args[5]

        
		$adal = "$($AzureADPowershellModuleDir)\Microsoft.IdentityModel.Clients.ActiveDirectory.dll"
		$tMod = [System.Reflection.Assembly]::LoadFrom($adal)

        [string] $authority = "https://login.microsoftonline.com/$Tenant"
		$authContext = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext" -ArgumentList $authority
		$PromptBehavior = [Microsoft.IdentityModel.Clients.ActiveDirectory.PromptBehavior]::Auto
		$platformParam = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.PlatformParameters" -ArgumentList $PromptBehavior
		$userId = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.UserIdentifier" -ArgumentList $UserPrincipalName, "OptionalDisplayableId"
		$authResult = $authContext.AcquireTokenAsync($resourceAppIdURI, $clientId, $redirectUri, $platformParam, $userId)
		$AuthHeader=$authResult.result.CreateAuthorizationHeader()

		$headers = @{
		  "Authorization" = $AuthHeader
		  "Content-Type"  = "application/json"
          "ExpiresOn"     = $authResult.Result.ExpiresOn
		}
		
		Return $headers
	}
	$Wait = Wait-Job $job
	$jobResult = Receive-Job $job
	Return $jobResult
}