Scenario: Using Graph API via PowerShell, you can run the following to build and execute a URI to find the Exchange Custom Attributes (or AD Extension Attributes), or other information, for a user:
Scriptlet:
Note: Prerequisite: It performs a get-accesstoken function which can be found and loaded from this blog: Get an Access Token for Graph API via PowerShell – Ex-Shell
#Build the URI
$appuri = 'https://graph.microsoft.com/v1.0/users/SteveMan@SuperHero.com?$Select=id,displayname,mail,officeLocation,onPremisesExtensionAttributes'
$Execute the URI
$appuri = ([System.Uri]$appuri).AbsoluteUri
$header = get-accesstoken
$results = @()
$RestSplat = @{
URI = $appuri
Headers = $header
Method = 'GET'
ContentType = "application/json"
}
$Tempresults = Invoke-RestMethod @RestSplat
#Display the Results
$TempResults
#Display the ExtensionAttributes
$tempresults.onPremisesExtensionAttributes
Ex-Shell 