I have Blazor WebAssembly application on .net 8. I tried to implement custom authentication in it, but my code doesn’t work. Elements located in the block [Authorized] are not displayed. In my solution i have 3 projects: Server, Client, Shared.

Server.Program.cs

builder.Services.AddAuthentication(o =>
{
    o.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    o.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
}).AddJwtBearer(o =>
{
    o.RequireHttpsMetadata = false;
    o.SaveToken = true;
    o.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(JwtAuthenticationManager.JWT_SECURITY_KEY)),
        ValidateAudience = false
    };
});
builder.Services.AddSingleton<UserAccountService>();
builder.Services.AddAuthorizationCore();
builder.Services.AddScoped<AuthenticationStateProvider, CustomAuthenticationStateProvider>();
builder.Services.AddBlazoredSessionStorage();

Client.Program.cs

uilder.Services.AddBlazoredSessionStorage();
builder.Services.AddScoped<AuthenticationStateProvider, CustomAuthenticationStateProvider>();
builder.Services.AddAuthorizationCore();

Client.CustomAuthenticationStateProvider.cs

public class CustomAuthenticationStateProvider : AuthenticationStateProvider
{
    private readonly ISessionStorageService _sessionStorage;
    private ClaimsPrincipal _anonymous = new ClaimsPrincipal(new ClaimsIdentity());

    public CustomAuthenticationStateProvider(ISessionStorageService sessionStorage)
    {
        _sessionStorage = sessionStorage;
    }
    public override async Task<AuthenticationState> GetAuthenticationStateAsync()
    {
        try
        {
            var userSession = await _sessionStorage.ReadEncryptedItemAsync<UserSession>("userSession");
            if (userSession == null)
                return await Task.FromResult(new AuthenticationState(_anonymous));
            var claimsPrincipal = new ClaimsPrincipal(new ClaimsIdentity(new List<Claim>
            {
                new Claim(ClaimTypes.Name,userSession.UserName),
                new Claim(ClaimTypes.NameIdentifier,userSession.Id.ToString())
            }, "JwtAuth"));
            return await Task.FromResult(new AuthenticationState(claimsPrincipal));
        }
        catch 
        {
            return await Task.FromResult(new AuthenticationState(_anonymous));
        }

    }
     public async Task UpdateAuthenticationState(UserSession? userSession)
     {
        ClaimsPrincipal claimsPrincipal;
        if (userSession != null)
        {
            claimsPrincipal = new ClaimsPrincipal(new ClaimsIdentity(new List<Claim>
            {
                new Claim(ClaimTypes.Name, userSession.UserName),
                new Claim(ClaimTypes.NameIdentifier,userSession.Id.ToString())
            }));
            userSession.ExpiryTimeStamp = DateTime.Now.AddSeconds(userSession.ExpiresIn);
            await _sessionStorage.SaveItemEncryptedAsync("UserSession", userSession);
        }
        else
        {
            claimsPrincipal = _anonymous;
            await _sessionStorage.RemoveItemAsync("UserSession");
        }
        NotifyAuthenticationStateChanged(Task.FromResult(new AuthenticationState(claimsPrincipal)));
     }
    public async Task<string> GetToken()
    {
        var result = string.Empty;
        try
        {
            var userSession = await _sessionStorage.ReadEncryptedItemAsync<UserSession>("UserSession");
            if ( userSession != null && DateTime.Now< userSession.ExpiryTimeStamp)
                result = userSession.Token;
        }
        catch
        {

        }
        return result;
    }
}

I have an assumption that the problems are due to the fact that the provider is registered in both projects, but I don’t know how to fix it. If I remove the provider registration from the server project, the application does not start.