Consider the following scenario:
- You run the Set-CsExternalAccessPolicy cmdlet to set the value of the EnableOutsideAccess parameter to false in Microsoft Skype for Business Server 2015.
- Users are using Microsoft Skype for Business mobile apps and Microsoft Skype for Business on Mac clients.
In this scenario, Unified Communications Web API (UCWA) clients still can sign in from external networks even if the external access setting is disabled by the policy.