Update Grant-CsExternalAccessPolicy.md

Author: tomkau

skype/skype-ps/skype/Grant-CsExternalAccessPolicy.md

@@ -15,9 +15,9 @@ ms.reviewer: rogupta
 ## SYNOPSIS
 
 Enables you to assign an external access policy to a user or a group of users.
-External access policies determine whether or not your users can: 1) communicate with users who have Session Initiation Protocol (SIP) accounts with a federated organization; 2) communicate with users who have SIP accounts with a public instant messaging (IM) provider such as MSN; and, 3) access Microsoft Teams or Skype for Business Server over the Internet, without having to log on to your internal network.
+External access policies determine whether or not your users can: 1) communicate with users who have Session Initiation Protocol (SIP) accounts with a federated organization; 2) communicate with users who are using custom applications built with [Azure Communication Services (ACS)](/azure/communication-services/concepts/teams-interop); 3) access Skype for Business Server over the Internet, without having to log on to your internal network; and, 4) communicate with users who have SIP accounts with a public instant messaging (IM) provider such as Skype.
+
 This cmdlet was introduced in Lync Server 2010.
-Please note: althought the _Applies to_ section does not mention it, this cmdlet also applies to Microsoft Teams.
 
 ## SYNTAX
 
@@ -42,9 +42,12 @@ Note that enabling federation will not automatically provide users with this cap
 Instead, you must enable federation, and then assign users an external access policy that gives them the right to communicate with federated users.
 
 2.
-Communicate with people who have SIP accounts with a public instant messaging service such as MSN.
+(Microsoft Teams only) Communicate with users who are using custom applications built with [Azure Communication Services (ACS)](/azure/communication-services/concepts/teams-interop). This policy setting only applies if ACS federation has been enabled at the tenant level using the cmdlet [Set-CsTeamsAcsFederationConfiguration](/powershell/module/teams/set-csteamsacsfederationconfiguration).
 
 3.
+Communicate with people who have SIP accounts with a public instant messaging service such as Skype.
+
+4.
 Access Skype for Business Server over the Internet, without having to first log on to your internal network.
 This enables your users to use Skype for Business and log on to Skype for Business Server from an Internet café or other remote location.