I\'m using ASP.NET Core 2.1 Identity. I\'ve overridden IdentityUser because I need to add some additional properties on the user.
In Startup.cs
servic
I know that the author already fixed his issue ,but I'll add this for anyone else that did all the steps in the above answer and still has this error.
From Aspnet github
You must delete autogenerated IdentityHostingStartup.Configure method in Areas/Identity/IdentityHostingStartup.cs