Azure App Service—SameSite cookie handling and .NET Framework 4.7.2 patch

As part of the January 2020 update to Azure App Service, .NET Framework patches that update how .NET framework apps handle the SameSite cookie property are being installed. The service is also deploying an App Service compatibility behavior that applies to all applications running on App Service for scenarios where a cookie has set the SameSite property to "None".
Source: Azure Roadmap