Authentication in Exchange Admin API using Graph MSAL

gistfile1.txt

Import-Module Microsoft.Graph.Authentication -ErrorAction Stop
$graphModule = Get-Module Microsoft.Graph.Authentication
$msalDll = Get-ChildItem -Path $graphModule.ModuleBase -Filter "Microsoft.Identity.Client.dll" -Recurse | Select-Object -First 1
if ($msalDll) {
    Add-Type -Path $msalDll.FullName
    Write-Host "Microsoft.Identity.Client loaded successfully from: $($msalDll.FullName)"
}
else {
    Write-Error "Microsoft.Identity.Client.dll not found"
}
$clientId = "a7bd291b-c836-479b-a03e-xxxxxxx"
$tenantId = "13af9f3c-b494-4795-bb19-xxxxx"
$app = [Microsoft.Identity.Client.PublicClientApplicationBuilder]::Create($clientId).WithDefaultRedirectUri().WithTenantId($tenantId).Build()
 
$scopes = [System.Collections.Generic.List[string]]@("https://outlook.office365.com/.default")
$AccessToken = ($app.AcquireTokenInteractive($scopes).ExecuteAsync().Result).AccessToken