Hangfire Dashboard Authorization not working

Ive implemented IDashboardAuthorizationFilter interface like this:

public bool Authorize(Dashboard context)
var owinContext = new OwinContext(context.GetOwinEnviroment());
return owinContext.Authentication.User.Identity.IsAuthenticated;

and in the Startup.cs:
app.UseHangFireDashboard("/hangfire", new DashboardOptions {
Authorization = new [] {new AuthorizationFilter()}

but the Server.User property in the owinContext is null.

I’m experiencing the same with IdentityServer3. Even though I’m accessing as a logged-in user, the Request.User is null.