Startup.cs

using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.ApplicationInsights.DependencyCollector;
using Microsoft.ApplicationInsights.Extensibility;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Authorization;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json.Serialization;

namespace gicalcapi
{
    public class Startup
    {
        ...
        
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc(x =>
            {
                if (apiConfiguration.AuthorizationEnabled)
                {
                    var policy = new AuthorizationPolicyBuilder()
                        .RequireAuthenticatedUser()
                        .Build();
                    x.Filters.Add(new AuthorizeFilter(policy));
                }
            });
        }
        
        ...
    }
}