asp.net core authorization - Operation authorization handler

I have strange problem and can not debug it.

I am trying to use OperationAuthorizationRequirement and an AuthorizationHandler.

When I place breakpoint in controller, I always get 403 result, so I tried to place breakpoint inside CountryControllerAuthorizationHandler, and it is never triggered. But in controller, I always get result of AuthorizeAsync false but i cannot understand why i cannot get breakpoint being hit or triggered. Am I doing some stupid mistake? Anyway as I can see, resource is NOT null and also User and claims are NOT null:

Here is my code:

CountryControllerAuthorizationHandler:

public class CountryControllerAuthorizationHandler : AuthorizationHandler<OperationAuthorizationRequirement, Country>
{
    protected override Task HandleRequirementAsync(AuthorizationHandlerContext context,
                                                   OperationAuthorizationRequirement requirement,
                                                   Country resource)
    {
        if (requirement.Name == Operations.ReadDetail.Name &&
            context.User.Claims.FirstOrDefault(a => a.Type == "userType")?.Value == "customer"
            )
        {
            context.Succeed(requirement);
        }

        if (requirement.Name == Operations.Create.Name &&
            context.User.Claims.FirstOrDefault(a => a.Type == "userType")?.Value == "1"
            )
        {
            context.Succeed(requirement);
        }

        if (requirement.Name == Operations.Update.Name &&
            context.User.Claims.FirstOrDefault(a => a.Type == "userType")?.Value == "1"
            )
        {
            context.Succeed(requirement);
        }

        if (requirement.Name == Operations.Delete.Name &&
           context.User.Claims.FirstOrDefault(a => a.Type == "userType")?.Value == "1"
           )
        {
            context.Succeed(requirement);
        }

        return Task.CompletedTask;
    }
}

Operations class:

public static class Operations
{
    public static OperationAuthorizationRequirement Create =
        new OperationAuthorizationRequirement { Name = nameof(Create) };
    public static OperationAuthorizationRequirement Read =
        new OperationAuthorizationRequirement { Name = nameof(Read) };
    public static OperationAuthorizationRequirement ReadDetail =
      new OperationAuthorizationRequirement { Name = nameof(ReadDetail) };
    public static OperationAuthorizationRequirement Update =
        new OperationAuthorizationRequirement { Name = nameof(Update) };
    public static OperationAuthorizationRequirement Delete =
        new OperationAuthorizationRequirement { Name = nameof(Delete) };
}

Startup.cs:

services.AddSingleton<IAuthorizationHandler, CountryControllerAuthorizationHandler>();

services.AddMvcCore()
    .AddAuthorization()
    .AddJsonFormatters();

services.AddAuthentication("Bearer")
    .AddIdentityServerAuthentication(options =>
    {
        options.Authority = "http://localhost:5000";
        options.RequireHttpsMetadata = false;
        options.ApiName = "api1";
    });

And finally controller:

public CountriesController(ICountryService service, IAuthorizationService authorizationService)
{
    _authorizationService = authorizationService;
    this.countryService = service;
}

public async Task<object> GetDetail()
{
    var obj = countryService.Get_DETAILS();
    var authorizationResult = await _authorizationService.AuthorizeAsync(User, obj, Operations.ReadDetail);

    if (authorizationResult.Succeeded)
    {
        return Ok(obj);
    }
    else if (User.Identity.IsAuthenticated)
    {
        return new ForbidResult();
    }
    else
    {
        return new ChallengeResult();
    }
}