How to authorize CORS preflight request on IIS with Windows Authentication

Question

I have an API on ASP.net Core 2 (windows authentication) and a front on angular. I make a cors configuration to querying my backend from the SPA angular, but im blocked in

Answer 1

Preflight request does not send authentication information. So, enable anonymous authentication as well (no need to remove windows authentication). refer to https://stackoverflow.com/a/50354772/946773