Blazor client doesn't reach API endpoint in the same solution

I have a blazor client project which I want to use an API in the same solution. But I can't seem to reach the API. In the blazor project program.cs I have set the BaseAdress like this:

public static async Task Main(string[] args){    var builder = WebAssemblyHostBuilder.CreateDefault(args);    builder.RootComponents.Add<App>("app");    builder.Services.AddBlazoredLocalStorage();    builder.Services.AddAuthorizationCore();    builder.Services.AddScoped<AuthenticationStateProvider, ApiAuthenticationStateProvider>();    builder.Services.AddScoped<IAuthService, AuthService>();    builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });    await builder.Build().RunAsync();}

Inside the blazor app I have an Authservice which is trying to call the API. The service's register method looks like this:

public async Task<HttpResponseMessage> Register(UserRegisterViewModel model){    var result = await _httpClient.PostAsJsonAsync("Account/Register", model);    return result;}

As you can see the Register-method is trying to call a register-action in a account controller, which I have in an API in the same solution. This is the Action:

[Route("Account")][ApiController]public class AccountController : ControllerBase{    private readonly UserManager<ApplicationUser> _userManager;    private readonly SignInManager<ApplicationUser> _signInManager;    private readonly IConfiguration _configuration;        public AccountController(IConfiguration configuration, UserManager<ApplicationUser> userManager, SignInManager<ApplicationUser> signInManager)        {            _userManager = userManager;            _signInManager = signInManager;            _configuration = configuration;        }        [HttpPost]        [Route("Register")]        public async Task<IActionResult> RegisterAsync([FromBody]UserRegisterViewModel model)         {            if(!ModelState.IsValid)                return BadRequest(ModelState);            ApplicationUser user = new ApplicationUser            {                Email = model.Email,                UserName = model.Email            };            IdentityResult result = await _userManager.CreateAsync(user, model.Password);            if (!result.Succeeded)                return BadRequest(result.Errors);            return Ok();        }        .....        .....}

But for some reason I never reach to action RegisterAsync. Why is this? What am I missing?