update

Author: tapanm-MSFT

powerapps-docs/maker/portals/oauth-implicit-grant-flow.md

@@ -6,7 +6,7 @@ manager: kvivek
 ms.service: powerapps
 ms.topic: conceptual
 ms.custom: 
-ms.date: 10/07/2019
+ms.date: 01/24/2020
 ms.author: tapanm
 ms.reviewer:
 ---
@@ -17,6 +17,14 @@ This feature allows a customer to make client-side calls to external APIs and se
 
 OAuth 2.0 implicit grant flow supports endpoints that a client can call to get an ID token. Two endpoints are used for this purpose: [authorize](#authorize-endpoint-details) and [token](#token-endpoint-details).
 
+> [!NOTE]
+> Power Apps portals supports following OpenIdConnect flows and response types:
+>
+> - **Implicit Flow** with response types *id_token* or *id_token token*.
+> - **Hybrid Flow** with response type *code id_token*.
+>
+> **Authorization Code Flow** with response type *code* is **not supported**. For more information, read [OpenID Connect](https://openid.net/specs/openid-connect-core-1_0.html#Authentication) documentation for authentication.
+
 ## Authorize endpoint details 
 
 The URL for authorize endpoint is: `<portal_url>/_services/auth/authorize`. The authorize endpoint supports the following parameters: