Integration Testing with .NET Core and NUnit

I have a controller that is taking a JWT Claim, and if the claim is correct, then I am returing a Json string of categories as follows :-

[Authorize(Policy = "OnlyValidUsers")]
[Route("api/[controller]")]
public class CategoriesController : Controller
{
    private readonly IGenericService<Category> _categoriesService;

    public CategoriesController(IGenericService<Category> categoriesService)
    {
        _categoriesService = categoriesService;
    }

    [Authorize(Policy = "GenericUser")]
    [HttpGet("/api/Categories/Get", Name = "GetCategories")]
    public async Task<IActionResult> Get()
    {
        var categories = await _categoriesService.GetAll();
        return Json(categories);
    }
}

This happens after the user logins in to my system, and gets a bearer token.

I am trying to test that in an integration test as follows:-

[TestFixture]
public class CategoriesControllerIntegrationTests
{
    private HttpClient _client;
    private Category _testCategory;
    private string _request;

    [SetUp]
    public void Setup()
    {
        var basePath = PlatformServices.Default.Application.ApplicationBasePath;
        var projectPath = Path.GetFullPath(Path.Combine(basePath, "../../../../SportsStore.Tests"));

        var server = new TestServer(Utils.GetHostBuilder(new string[] { })
            .UseContentRoot(projectPath)
            .UseEnvironment("Development")
            .UseStartup<Startup>());

        _client = server.CreateClient();
        _testCategory = new Category
        {
            Name = Enums.GetEnumDescription(Enums.CategoryTestData.Name)
        };
        _request = Enums.GetEnumDescription(Enums.Requests.Categories);
    }

    [Test]
    public async Task Get_ReturnsAListOfCategories_CategoriesController()
    {
        var response = await _client.GetAsync(_request + "Get");
        response.EnsureSuccessStatusCode();

        Assert.IsTrue(true);
    }

The Utils class is as follows:-

public class Utils
{
    public static IWebHostBuilder GetHostBuilder(string[] args)
    {
        var config = new ConfigurationBuilder()
                   .AddCommandLine(args)
                   .AddEnvironmentVariables(prefix: "ASPNETCORE_")
                   .Build();

        return new WebHostBuilder()
            .UseConfiguration(config)
            .UseKestrel()
            .UseStartup<Startup>();
    }
}

When I run the test, I am getting a 401 (Unauthorized) which is expected. How can I make this test pass? How can I pass the claim in the test to verify that its working?

Also, if I remove the [Authorize] filters, I am still getting a 401 (Unauthorized) which I think should not happen.

Any help will be greatly appreciated!

Thanks