Access_token is getting truncated when making a graph API call inside Azure function

Question

I am trying to get Azure AD users via Graph API using Azure function

First I try to get token

$response = $Invoke-RestMethod -Method Post -Uri $tokenUrl -ContentType "application/x-www-form-urlencoded" -Body $body
Write-Host "response $response.access_token"

Token I am getting printed is getting truncated and not the complete token. However from postman I am receiving the complete token.

I also tried "select-object", but even that is also providing same truncated output

$response = Invoke-RestMethod -Method Post -Uri $tokenUrl -ContentType "application/x-www-form-urlencoded" -Body $body | Select-Object -ExpandProperty access_token
    Write-Host "response $response" 

Can you let me know how to get the complete token

Answer 1

Hi @markhilton

Refer to the sample script below and it should work for you.

#region Authentication
#We use the client credentials flow as an example. For production use, REPLACE the code below with your preferred auth method. NEVER STORE CREDENTIALS IN PLAIN TEXT!!!

#Variables to configure
$tenantID = "tenant.onmicrosoft.com" #your tenantID or tenant root domain
$appID = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" #the GUID of your app.
$client_secret = "verylongsecurestring" #client secret for the app

#Prepare token request
$url = 'https://login.microsoftonline.com/' + $tenantId + '/oauth2/v2.0/token'

$body = @{
    grant_type = "client_credentials"
    client_id = $appID
    client_secret = $client_secret
    scope = "https://graph.microsoft.com/.default"
}

#Obtain the token
Write-Verbose "Authenticating..."
try { $tokenRequest = Invoke-WebRequest -Method Post -Uri $url -ContentType "application/x-www-form-urlencoded" -Body $body -UseBasicParsing -ErrorAction Stop }
catch { Write-Host "Unable to obtain access token, aborting..."; return }

$token = ($tokenRequest.Content | ConvertFrom-Json).access_token

Write-Host $token

Print token:

Hope this helps.

If the reply is helpful, please click Accept Answer and kindly upvote it. If you have additional questions about this answer, please click Comment.