Update secure-rest-api.md

Adding b2c-public-preview-feature

Author: yoelhor

articles/active-directory-b2c/secure-rest-api.md

@@ -9,7 +9,7 @@ manager: celestedg
 ms.service: active-directory
 ms.workload: identity
 ms.topic: conceptual
-ms.date: 03/27/2020
+ms.date: 03/30/2020
 ms.author: mimart
 ms.subservice: B2C
 ---
@@ -193,6 +193,8 @@ A bearer token is an opaque string. It can be a JWT access token or any string t
 - **Bearer token**. To be able to send the bearer token in the Restful technical profile, your policy needs to first acquire the bearer token and then use it in the RESTful technical profile.  
 - **Static bearer token**. Use this approach when your REST API issues a long-term access token. To use a static bearer token, create a policy key and make a reference from the RESTful technical profile to your policy key. 
 
+[!INCLUDE [b2c-public-preview-feature](../../includes/active-directory-b2c-public-preview.md)]
+
 ## Using OAuth2 Bearer  
 
 The following steps demonstrate how to use client credentials to obtain a bearer token and pass it into the Authorization header of the REST API calls.