adding ADFS and B2C note

Author: rwike77

articles/active-directory/develop/quickstart-configure-app-access-web-apis.md

@@ -109,6 +109,9 @@ To configure application settings based on the platform or device, you're target
    | **Android**          | Provide the app **Package name**, which you can find in the AndroidManifest.xml file.<br/>Generate and enter the **Signature hash**. Adding the signature hash automatically creates a redirect URI for the application.  |
    | **Mobile and desktop applications**  | Optional. Select one of the recommended **Suggested redirect URIs** if you're building apps for desktop and devices.<br/>Optional. Enter a **Custom redirect URI**, which is used as the location where Azure AD will redirect users in response to authentication requests. For example, for .NET Core applications where you want interaction, use `http://localhost`. |
 
+   > [!NOTE]
+   > On Active Directory Federation Services (AD FS) and Azure AD B2C, you must also specify a port number.  For example: `http://localhost:1234`. 
+
    > [!IMPORTANT]
    > For mobile applications that aren't using the latest Microsoft Authentication Library (MSAL) or not using a broker, you must configure the redirect URIs for these applications in **Desktop + devices**.