So there's a plan to migrate our old applications to ASP.NET Core (yey!) We use Windows Authentication as this is an internal application.

However, in order to lessen the cost, they (managers) want to use Linux for our dockers. But in my mind, how are we going to make Windows Authentication work if our web servers are in Linux?

Your web servers are supposed to be in Windows in order to authenticate users in AD right? Am I missing something?