Answer by Yura Babiy for Why is Asp.Net Core Kestrel server returns 404 to Ngrok and Controller is never gets called?

With some modifications to @PiGi78 answer, it did work. Here is the final solution:

public class Startup{    public void ConfigureServices(IServiceCollection services)    {        services.AddMvc().AddMvcOptions(ApplyMvcOptions);        services.AddControllersWithViews();        services.AddControllers().AddNewtonsoftJson();    }    private void ApplyMvcOptions(MvcOptions options)    {        options.EnableEndpointRouting = false;    }    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)    {        if (env.IsDevelopment())        {            app.UseDeveloperExceptionPage();        }        app.UseRouting();        app.UseMvc();        Bot.GetBotClientAsync().Wait();    }}

@PiGi78 thank you very much !