Has ASP.NET Core abandoned Windows Authentication Impersonation?

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No, ASP.NET Core has not abandoned Windows Authentication Impersonation. Impersonation is still supported in ASP.NET Core through the use of the WindowsIdentity class and its associated methods. However, the way in which Windows Authentication and Impersonation are implemented has changed with ASP.NET Core, and there are some differences from previous versions of ASP.NET. It is still possible to use Windows Authentication and Impersonation in ASP.NET Core, but it is important to carefully review the documentation and follow best practices to ensure that it is used correctly and securely.