AZ

In example missed [Controller](https://github.com/IdentityServer/IdentityServer4.Demo/blob/master/src/IdentityServer4Demo/Quickstart/Account/ExternalController.cs) because no external logins exists. I'm not sure, but looks like you can you example from other repository

It is special extension methods for asp.net core. I'll create example app with mvp of package and I'll share link.

Hi @FrancoisM I think It method already exists: public static Result Combine(this IEnumerable results, string errorMessagesSeparator)