从adfs服务器获取安全令牌时出错

要根据ADFS进行身份验证并检查声明，我希望从ADFS服务器获取安全令牌。然而，我使用的示例代码在请求令牌时总是会产生错误。示例代码如下：

 private static SecurityToken RequestSamlToken()
            {
                var factory = new WSTrustChannelFactory(
                    new UserNameWSTrustBinding(SecurityMode.TransportWithMessageCredential),
                    new EndpointAddress(adfsEndpoint));
                factory.TrustVersion = TrustVersion.WSTrust13;
                factory.Credentials.UserName.UserName = username;
                factory.Credentials.UserName.Password = password;
                var rst = new RequestSecurityToken
                {
                    RequestType = RequestTypes.Issue,
                    KeyType = KeyTypes.Bearer,  
                    AppliesTo = new EndpointReference(realm)
                };
                return factory.CreateChannel().Issue(rst);
            }

我得到以下错误：

System.ServiceModel.dll中发生类型为"System.ServiceModel.FFaultException"的未处理异常其他信息：ID3082:请求作用域无效或不受支持。

ADFS服务器中是否缺少任何不允许提供令牌的配置？另一个使用IdpInitialized Logon的代码片段用于生成SAML令牌。ADFS属性如下-

AcceptableIdentifiers                      : {}
AddProxyAuthorizationRules                 : exists([Type ==
                                             "http://schemas.microsoft.com/ws/2008/06/identity/claims/groupsid", Value
                                             == "S-1-5-32-544", Issuer =~ "^AD AUTHORITY$"]) => issue(Type =
                                             "http://schemas.microsoft.com/authorization/claims/permit", Value =
                                             "true");
                                                         c:[Type ==
                                             "http://schemas.microsoft.com/ws/2008/06/identity/claims/primarysid",
                                             Issuer =~ "^AD AUTHORITY$" ]
                                                                    => issue(store="_ProxyCredentialStore",types=("http
                                             ://schemas.microsoft.com/authorization/claims/permit"),query="isProxyTrust
                                             ManagerSid({0})", param=c.Value );
                                                         c:[Type ==
                                             "http://schemas.microsoft.com/ws/2008/06/identity/claims/proxytrustid",
                                             Issuer =~ "^SELF AUTHORITY$" ]
                                                                    => issue(store="_ProxyCredentialStore",types=("http
                                             ://schemas.microsoft.com/authorization/claims/permit"),query="isProxyTrust
                                             Provisioned({0})", param=c.Value );
ArtifactDbConnection                       : Data Source=np:''.'pipe'microsoft##wid'tsql'query;Initial
                                             Catalog=AdfsArtifactStore;Integrated Security=True
AuthenticationContextOrder                 : {urn:oasis:names:tc:SAML:2.0:ac:classes:Password,
                                             urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport,
                                             urn:oasis:names:tc:SAML:2.0:ac:classes:TLSClient,
                                             urn:oasis:names:tc:SAML:2.0:ac:classes:X509...}
AutoCertificateRollover                    : True
CertificateCriticalThreshold               : 2
CertificateDuration                        : 365
CertificateGenerationThreshold             : 20
CertificatePromotionThreshold              : 5
CertificateRolloverInterval                : 720
CertificateSharingContainer                : CN=6b987b00-35ce-44d9-97c8-561b6f1ac3dd,CN=ADFS,CN=Microsoft,CN=Program
                                             Data,DC=sciemetricdev,DC=com
CertificateThresholdMultiplier             : 1440
ClientCertRevocationCheck                  : None
ContactPerson                              :
DisplayName                                : ADFS
IntranetUseLocalClaimsProvider             : False
ExtendedProtectionTokenCheck               : Allow
FederationPassiveAddress                   : /adfs/ls/
HostName                                   : *************.com
HttpPort                                   : 80
HttpsPort                                  : 443
TlsClientPort                              : 49443
Identifier                                 : http://*******.com/adfs/services/trust
InstalledLanguage                          : en-US
LogLevel                                   : {Errors, Information, Verbose, Warnings}
MonitoringInterval                         : 1440
NetTcpPort                                 : 1501
NtlmOnlySupportedClientAtProxy             : False
OrganizationInfo                           :
PreventTokenReplays                        : False
ProxyTrustTokenLifetime                    : 21600
ReplayCacheExpirationInterval              : 60
SignedSamlRequestsRequired                 : False
SamlMessageDeliveryWindow                  : 5
SignSamlAuthnRequests                      : False
SsoLifetime                                : 480
PersistentSsoLifetimeMins                  : 10080
KmsiLifetimeMins                           : 1440
PersistentSsoEnabled                       : True
PersistentSsoCutoffTime                    : 1/1/0001 12:00:00 AM
KmsiEnabled                                : False
LoopDetectionEnabled                       : True
LoopDetectionTimeIntervalInSeconds         : 20
LoopDetectionMaximumTokensIssuedInInterval : 5
PasswordValidationDelayInMinutes           : 60
SendClientRequestIdAsQueryStringParameter  : False
WIASupportedUserAgents                     : {MSAuthHost/1.0/In-Domain, MSIE 6.0, MSIE 7.0, MSIE 8.0...}
ExtranetLockoutThreshold                   : 2147483647
ExtranetLockoutEnabled                     : False
ExtranetObservationWindow                  : 00:30:00