Blazor Custom Authentication State based on Roles using Claims Identity

I am using CustomAuthentication in order to validate weather a user has access to view a certain page

At the moment my page is able to be restricted based on

@attribute[Authorize]alone

But I want to be able to authorize based on roles

@attribute[Authorize(Roles="admin")]

when I apply this it gives me a 403 forbidden error

My CustomAuth Class fetches the role from a DB like so

public class AuthService : AuthenticationStateProvider{    private HttpClient _client;    public AuthService(HttpClient client)    {        _client = client;        Console.WriteLine(_client.BaseAddress);    }    public override async Task<AuthenticationState> GetAuthenticationStateAsync()    {        try        {            var person = System.Security.Principal.WindowsIdentity.GetCurrent()?.Name;            string temp = "personnamehere";                var userinfo = await _client.GetFromJsonAsync<RoleClass>($"/api/BlazorAppAuthService/Users/{temp}");                if (userinfo is null)                {                    return new AuthenticationState(new ClaimsPrincipal(new ClaimsIdentity()));                }                var claims = new List<Claim>                    {                        new Claim(ClaimTypes.Name, person),                        new Claim(ClaimTypes.Role, userinfo.Role.ToLower())                    };            var identity = new ClaimsIdentity(claims, "Windows");            var user = new ClaimsPrincipal(identity);            foreach (var claim in claims)            {                Console.WriteLine($"{claim.Type} : {claim.Value}");            }            var authState = new AuthenticationState(user);            NotifyAuthenticationStateChanged(Task.FromResult(authState));            return authState;                    //  var role = await _client.GetFromJsonAsync<string>("");        }        catch (Exception ex)        {            return new AuthenticationState(new ClaimsPrincipal(new ClaimsIdentity()));        }    }//end of function}

}

I am using a temp value that is stored in my db just in order to pull the role. This is temporary

Program.cs (snippet of applicable lines)

builder.Services.AddAuthorizationCore();

builder.Services.AddAuthentication(NegotiateDefaults.AuthenticationScheme).AddNegotiate();

var app = builder.Build();

app.UseAuthentication();app.UseAuthorization();

My settings allow for windows Authentication

My app.razor contains the tags

Again it can work on Authorize alone but does not work based on roles.

Any help would be appreciated