After you install this update, Microsoft Skype for Business Server 2015 Unified Communications Web API (UCWA) will add the SameSite=None attribute to all cookies for supported browsers.
- .NET does not support SameSite fully, so you need to append "SameSite=None" to cookie.Path to make this work.
- Since “None” is a new value, old browsers will not recognize it and treat it as "SameSite=Strict". You need to make sure you do not set SameSite=None for browsers that don't support it. For more information, see SameSite=None: Known Incompatible Clients.
- You can track updates to .NET for this issue, see Upcoming SameSite Cookie Changes in ASP.NET and ASP.NET Core.