Keeping Authentication and Session in sync in asp.net core 3.x - Startup.cs identity

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services.AddIdentity<IdentityUser,IdentityRole>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddDefaultTokenProviders();
// services.AddDefaultIdentity must be adding its own fake
// Switched to services.AddIdentity<IdentityUser,IdentityRole>, and now I have to add it.
services.AddScoped<IEmailSender, FakeEmailSender>(); 

services.AddScoped<IUserClaimsPrincipalFactory<IdentityUser>, SeedSessionClaimsPrincipalFactory>();