fix command

Author: PatrickFarley

includes/cognitive-services-azure-active-directory-authentication.md

@@ -47,7 +47,7 @@ Now that you have a custom subdomain associated with your resource, you're going
    ```powershell-interactive
    $SecureStringPassword = ConvertTo-SecureString -String <YOUR_PASSWORD> -AsPlainText -Force
 
-   $app = New-AzADApplication -DisplayName <APP_DISPLAY_NAME> -IdentifierUris <APP_URIS> -Password $SecureStringPassword
+   $app = New-AzureADApplication -DisplayName <APP_DISPLAY_NAME> -IdentifierUris <APP_URIS> -PasswordCredentials $PasswordCredential
    ```
 
    You're going to need the **ApplicationId** in the next step.