我正在使用ASP.NET核心应用程序的UseOpenIdConnectAuthentication中间件来针对Dells云访问管理器令牌提供程序进行身份验证（设置为提供OpenId/OAuth2身份验证）。以下是代码：

app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AutomaticAuthenticate = true,
            AutomaticChallenge = true,
            AuthenticationScheme = "ClientCookie",
            CookieName = CookieAuthenticationDefaults.CookiePrefix + "ClientCookie",
            ExpireTimeSpan = TimeSpan.FromMinutes(5),
            LoginPath = new PathString("/signin"),
            LogoutPath = new PathString("/signout")
        });

        app.UseOpenIdConnectAuthentication(new OpenIdConnectOptions
        {
            RequireHttpsMetadata = false,
            SaveTokens = true,
            ClientId = "XYZClient_Id",
            ClientSecret = "XYZ_ClientSecret",
            ResponseType = OpenIdConnectResponseType.Code,
            PostLogoutRedirectUri = "https://example.com",
            Configuration = new OpenIdConnectConfiguration {
                AuthorizationEndpoint = "https://CAM.COM/CloudAccessManager/RPSTS/OAuth2/Default.aspx",
                TokenEndpoint = "https://CAM.COM/CloudAccessManager/RPSTS/OAuth2/Token.aspx",
                UserInfoEndpoint = "https://CAM.COM/CloudAccessManager/RPSTS/OAuth2/User.aspx",
                Issuer= "urn:CAM.COM/CloudAccessManager/RPSTS",
            }
        });

但是我现在在一个点上卡了几个小时。我得到了下面的错误：
安全令牌签名无效异常：IDX 10500：签名验证失败。没有可用于验证签名的安全密钥
我正在URL querystring https://example.com/signin-oidc?code=somecode&state=somestate中获取代码和状态
欢迎提供任何类型的指导。
UPDATE已添加颁发者签名密钥：

TokenValidationParameters = new TokenValidationParameters
                {
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration.GetValue<string>("AppSettings:ClientSecret")))
                }