该问题可能是由Identity Server的配置不正确所引起的。您可以尝试按照以下步骤来解决此问题：

1. 在您的应用程序的appsettings.json文件中，确保配置正确的Identity Server地址和客户端ID：

"Authentication": {
  "Scheme": "Cookies",
  "AutomaticAuthenticate": true,
  "AutomaticChallenge": true,
  "CookieName": "AuthCookie",
  "Events": {
    "OnRedirectToIdentityProvider": async context =>
    {
      context.ProtocolMessage.RedirectUri = 
        $"{context.Request.Scheme}://{context.Request.Host}{context.Request.PathBase}{context.Request.Path}";
    }
  },
  "OpenIdConnect": {
    "Authority": "https://identityserver.example.com",
    "ClientId": "your_client_id",
    "Scope": ["openid", "profile", "email"],
    "ResponseType": "code id_token",
    "GetClaimsFromUserInfoEndpoint": true,
    "SignInScheme": "Cookies",
    "SaveTokens": true,
    "UseTokenLifetime": false,
    "ClientSecret": "your_client_secret",
    "CallbackPath": "/signin-oidc",
    "SignedOutCallbackPath": "/signout-callback-oidc",
    "RemoteSignOutPath": "/signout-oidc",
    "RequireHttpsMetadata": true
  }
}

2. 在startup.cs文件的ConfigureServices方法中，确保启用了授权和Identity Server：

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddAuthorization();

    services.AddAuthentication(options =>
        {
            options.DefaultScheme = "cookies";
            options.DefaultChallengeScheme = "oidc";
        })
        .AddCookie("cookies")
        .AddOpenIdConnect("oidc", options =>
        {
            options.Authority = "https://identityserver.example.com";
            options.ClientId = "your_client_id";
            options.ClientSecret = "your_client_secret";
            options.ResponseType = "code id_token";
            options.Scope.Add("openid");
            options.Scope.Add("profile");
            options.Scope.Add("email");
            options.SaveTokens = true;
            options.Events