B2C config

apsettings.json

{
  "AzureAdB2C": {
    "Instance": "https://login.microsoftonline.com/tfp/",
    "ClientId": "8b2b1e43-a2f7-4538-afbf-9b7ac293ea1f",
    "Domain": "aureliab2c.onmicrosoft.com",
    "SignUpSignInPolicyId": "B2C_1_signupin"
  },
  "Logging": {
    "IncludeScopes": false,
    "Debug": {
      "LogLevel": {
        "Default": "Warning"
      }
    },
    "Console": {
      "LogLevel": {
        "Default": "Warning"
      }
    }
  }
}

startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddAuthentication(sharedOptions =>
    {
        sharedOptions.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
    })
    .AddAzureAdB2CBearer(options => Configuration.Bind("AzureAdB2C", options));

    services.AddMvc();
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseCors(builder =>
    {
        builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod();
    });

    app.UseAuthentication();
    app.UseMvc();
}