Merge pull request #106536 from metanMSFT/metan/update-immersive-reader-script

[CogSvcs] Immersive Reader: Ensure URI is valid in powershell script

Author: PRMerger15

articles/cognitive-services/immersive-reader/how-to-create-immersive-reader.md

@@ -1,7 +1,7 @@
 ---
 title: "Create an Immersive Reader Resource"
 titleSuffix: Azure Cognitive Services
-description: This article will show you how to create a new Immersive Reader resource with a custom subdomain and then configure Azure AD in your Azure tenant.
+description: This article will show you how to create a new Immersive Reader resource with a custom subdomain and then configure Azure AD in your Azure tenant. 
 services: cognitive-services
 author: rwaller
 manager: guillasi
@@ -43,6 +43,11 @@ The script is designed to be flexible. It will first look for existing Immersive
         [Parameter(Mandatory=$true)] [String] $AADAppClientSecret
     )
     {
+        $unused = ''
+        if (-not [System.Uri]::TryCreate($AADAppIdentifierUri, [System.UriKind]::Absolute, [ref] $unused)) {
+            throw "Error: AADAppIdentifierUri must be a valid URI"
+        }
+
         Write-Host "Setting the active subscription to '$SubscriptionName'"
         $subscriptionExists = Get-AzSubscription -SubscriptionName $SubscriptionName
         if (-not $subscriptionExists) {