List Azure AD groups via Rest Graph API in Powershell

The following PowerShell snipped shows how to acquire acces token based on client id/client secret via REST Graph API and list all Azure AD groups in Powershell:

param
(
	[Parameter(Mandatory=$true)]
	[string]$Tenant,
	[Parameter(Mandatory=$true)]
	[string]$ClientId,
	[Parameter(Mandatory=$true)]
	[string]$ClientSecret
)

$currentDir = [System.IO.Directory]::GetCurrentDirectory()
$dllCommonDir = resolve-path($currentDir + "\..\..\Assemblies\Common\")
[System.Reflection.Assembly]::LoadFile([System.IO.Path]::Combine($dllCommonDir, "Microsoft.Identity.Client.dll"))

function GetAccessToken($tenant, $clientId, $clientSecret)
{
	$appCredentials = New-Object Microsoft.Identity.Client.ClientCredential -ArgumentList $clientSecret
	$aadLoginUri = New-Object System.Uri -ArgumentList "https://login.microsoftonline.com/"
	$authorityUri = New-Object System.Uri -ArgumentList $aadLoginUri, $tenant
	$authority = $authorityUri.AbsoluteUri
	$redirectUri = "urn:ietf:wg:oauth:2.0:oob"
	$clientApplication = New-Object Microsoft.Identity.Client.ConfidentialClientApplication($clientId, $authority, $redirectUri, $appCredentials, $null, $null)
	[string[]]$defaultScope = @("https://graph.microsoft.com/.default")
	$authenticationResult = $clientApplication.AcquireTokenForClientAsync($defaultScope).Result
	return $authenticationResult.AccessToken
}

function RetrieveGroupsRest($accessToken)
{
	$authHeader = @{
		"Content-Type"="application\json"
		"Authorization"="Bearer " + $accessToken
		}

	$uri = "https://graph.microsoft.com/v1.0/groups"
    $result = @()
    do{
        $objects = Invoke-RestMethod -Uri $uri -Headers $authHeader -Method Get
        $uri = $objects.'@odata.nextlink'
        $result = $result + $objects.value
       
    }until ($uri -eq $null)
	return $result
}

$accessToken = GetAccessToken $Tenant $ClientId $ClientSecret
$dataFromGraphAPI = RetrieveGroupsRest $accessToken
$dataFromGraphAPI | ft -Property id,displayName