Asp。net OpenID标识服务器指定范围导致错误

我有一个ASP。Net web表单网站,我想通过Identity Server 3进行身份验证。在Identity Server应用程序中,我定义了一个范围列表(其中一个是“电子邮件”)。但是,当我运行代码并尝试进行身份验证时,会出现一个错误。如果我删除Scope属性,它运行正常,但不包括我请求的Scope字段(只有通用声明)。这是我的代码:

Public Sub ConfigureAuth(app As IAppBuilder)
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
            JwtSecurityTokenHandler.DefaultInboundClaimTypeMap = New Dictionary(Of String, String)
            app.UseCookieAuthentication(New CookieAuthenticationOptions() With {
                .AuthenticationType = "Cookies"
            })

            Dim OpenIdAuthOption = New OpenIdConnectAuthenticationOptions() With {
               .Authority = "https://myidentityserver.azurewebsites.net/core/",
               .ClientId = "adfasdfafasdfasfasf",
               .RedirectUri = "https://localhost:44321/default.aspx/",
               .ResponseType = OpenIdConnectResponseType.IdTokenToken,
               .SignInAsAuthenticationType = "Cookies",
               .Scope = "email",
               .Notifications = New OpenIdConnectAuthenticationNotifications() With {
                    .SecurityTokenReceived = Function(ctx)
                                                 Return Task.FromResult(0)
                                             End Function,
                    .MessageReceived = Function(ctx)
                                           Return Task.FromResult(0)
                                       End Function,
                    .SecurityTokenValidated = Function(ctx)
                                                  Dim claimPrincipal = ctx.AuthenticationTicket.Identity
                                                  TransformClaims(claimPrincipal)
                                                  Return Task.FromResult(0)
                                              End Function,
                    .AuthorizationCodeReceived = Function(ctx)
                                                     Return Task.FromResult(0)
                                                 End Function,
                    .RedirectToIdentityProvider = Function(context)
                                                      RedirectLogin(context)
                                                      Return Task.FromResult(0)
                                                  End Function
                    }
            }
            app.UseOpenIdConnectAuthentication(OpenIdAuthOption)
        End Sub

我得到的错误是:

“OpenIdConnectMessage.Error不为null,表示有错误。错误: “无效的请求”。错误描述(可能为空):“”。错误_Uri (可能是空的):''。"

有人能解释一下我如何从Identity Server获取范围值(如“电子邮件”)吗?