Olá, quando eu executo esse endpoint "http://localhost:5000/api/login" no postman com esse corpo:

{ "login": "bruno", "passwword": "123" }

ocorre esse erro: System.InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Identity.SignInManager1[Microsoft.AspNetCore.Identity.Usuario]' while attempting to activate 'Alura.WebAPI.AuthProvider.LoginController'.

Minha classe Controller:

using System;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Threading.Tasks;
using Alura.ListaLeitura.Seguranca;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Microsoft.IdentityModel.Tokens;

namespace Alura.WebAPI.AuthProvider
{
    [ApiController]
    [Route("api/[controller]")]
    public class LoginController : ControllerBase
    {
        private readonly SignInManager<Usuario> _signInManager;

        public LoginController(SignInManager<Usuario> signInManager)
        {
            _signInManager = signInManager;
        }

        [HttpPost]
        public async Task<IActionResult> Token(LoginModel model)
        {
            if (ModelState.IsValid)
            {
                var result = await _signInManager.PasswordSignInAsync(model.Login, model.Password, true, true);
                if (result.Succeeded)
                {
                    var direitos = new[]
                    {
                        new Claim(JwtRegisteredClaimNames.Sub, model.Login),
                        new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
                    };

                    var chave = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes("alura-webapi-authentication-valid"));
                    var credencias = new SigningCredentials(chave, SecurityAlgorithms.HmacSha256);

                    var token = new JwtSecurityToken(
                        issuer: "Alura.WebApp",
                        audience: "Postman",
                        claims: direitos,
                        signingCredentials: credencias,
                        expires: DateTime.Now.AddMinutes(30)

                    );

                    var tokenString = new JwtSecurityTokenHandler().WriteToken(token);

                    return Ok(tokenString);
                }
                return Unauthorized();
            }
            return BadRequest();
        }
    }
}

e minha classe Startup:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Alura.ListaLeitura.Persistencia;
using Alura.ListaLeitura.Seguranca;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using IHostingEnvironment = Microsoft.AspNetCore.Hosting.IHostingEnvironment;

namespace Alura.WebAPI.AuthProvider
{
    public class Startup
    {
        public IConfiguration Configuration { get; }

        public Startup(IConfiguration config)
        {
            Configuration = config;
        }

        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<AuthDbContext>(options => {
                options.UseSqlServer(Configuration.GetConnectionString("AuthDB"));
            });

            services.AddIdentity<Usuario, IdentityRole>(options =>
            {
                options.Password.RequiredLength = 3;
                options.Password.RequireNonAlphanumeric = false;
                options.Password.RequireUppercase = false;
                options.Password.RequireLowercase = false;
            }).AddEntityFrameworkStores<AuthDbContext>();

            services.AddMvc();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseMvc();
        }
    }
}