só da HTTP ERROR 401

ta dando HTTP ERROR 401 ja fiz a conferencia do código e só da esse erro na pagina e no postman na compilacao nao esta apresentando nenhum erro

LOGINCONTROLLER

namespace Alura.WebAPI.WebApp.Api { [ApiController] [Route("api/[controller]")] public class LoginController : ControllerBase { private readonly SignInManager _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)
            {
                //cria token (header + payload + signature)

                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 credenciais = new SigningCredentials(chave, SecurityAlgorithms.HmacSha256);

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

                var tokenString = new JwtSecurityTokenHandler().WriteToken(token);
                return Ok(tokenString);
            }
            return Unauthorized(); //401
        }
        return BadRequest(); //400
    }
}

}

STARTUP

        services.AddAuthentication(options =>
        {
            options.DefaultAuthenticateScheme = "JwtBearer";
            options.DefaultChallengeScheme = "JwtBearer";
        }).AddJwtBearer("JwtBearer", options =>
        {
            options.TokenValidationParameters = new TokenValidationParameters
            {
                ValidateIssuer = true,
                ValidateAudience = true,
                ValidateLifetime = true,
                ValidateIssuerSigningKey = true,
                IssuerSigningKey = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes("alura-webapi-authentication-valid")),
                ClockSkew = TimeSpan.FromMinutes(5),
                ValidIssuer = "Alura.WebApp",
                ValidAudience = "Postman",
            };
        });