IHttpContextAccessor returns null Username claims in AspNetCore 5 API Controller - asp.net-core

Question

I have some Api Controllers in my AspNetCore 5 web application containing some methods which are available to unauthenticated users and some of them are only available for authorized users.
Assume that there is a ReviewController which all users can add review, but if the user is authenticated, we should fill username field.
Let's say in TestController:
[Route("api/[controller]/[action]/")]
[ApiController]
public class TestController
{
private readonly IHttpContextAccessor _httpContextAccessor;
public TestController(IHttpContextAccessor httpContextAccessor)
{
_httpContextAccessor = httpContextAccessor;
}
[HttpGet]
public string TestA()
{
return _httpContextAccessor.HttpContext.User.Identity.Name;
}
[HttpGet]
[Authorize(AuthenticationSchemes = JwtBearerDefaults.AuthenticationScheme)]
public string TestB()
{
return _httpContextAccessor.HttpContext.User.Identity.Name;
}
}
The only difference between two methods is Authorize attribute.
I setup JwtBearer authentication in the application with below setup.
ConfigureServices:
public override void ConfigureServices(IServiceCollection services)
{
var jwtConfig = new JwtConfig
{
Secret = "some secrets!",
Audience = "http://localhost:5000",
Expires = 600,
Issuer = "http://localhost:5000"
};
services.AddAuthorization();
services.AddAuthentication(options =>
{
options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(jwt =>
{
var key = Encoding.ASCII.GetBytes(jwtConfig.Secret);
jwt.SaveToken = true;
jwt.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = new SymmetricSecurityKey(key),
ValidateIssuer = true,
ValidateAudience = true,
RequireExpirationTime = true,
ValidateLifetime = true,
SaveSigninToken = true,
ValidAudience = jwtConfig.Audience,
ValidIssuer = jwtConfig.Issuer
};
});
services.AddHttpContextAccessor();
services.AddMvcCore()
.AddDataAnnotations()
.AddApiExplorer()
.AddFormatterMappings()
.AddCors();
}
And Configure:
public void Configure(IApplicationBuilder app)
{
app.UseDefaultFiles();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
When I am calling TestB it returns the logged in username. But, when I am calling TestA it returns null.
Why IHttpContextAccessor's user claims are not loaded and how can I access to IHttpContextAccessor's username and user claims in any condition? Assume that I am using that in other layers than controllers.