C# Id为[Id]的帐户不存在

我正在尝试从dynamics CRM检索我自己的姓名文件，但在检索过程中我一直收到此消息。（代码成功地将我的用户id与请求一起返回） Id为[Id]的System.ServiceModel.FaultException`1[Microsoft.Xrm.Sdk.OrganizationServiceFault]帐户不存在

   IOrganizationService oServiceProxy;
            try
            {
                //Create the Dynamics 365 Connection:
                CrmServiceClient oMSCRMConn = new Microsoft.Xrm.Tooling.Connector.CrmServiceClient("AuthType=Office365;Username=_username;Password=_password;URL=https://hrrevuat.crm4.dynamics.com/;");

                //Create the IOrganizationService:
                oServiceProxy = (IOrganizationService)oMSCRMConn.OrganizationWebProxyClient != null ?
                        (IOrganizationService)oMSCRMConn.OrganizationWebProxyClient :
                        (IOrganizationService)oMSCRMConn.OrganizationServiceProxy;
                if (oServiceProxy != null)
                {


                    //Get the current user ID:
                    Guid userid = ((WhoAmIResponse)oServiceProxy.Execute(new WhoAmIRequest())).UserId;



                    if (userid != Guid.Empty)
                    {
                        Console.WriteLine("Connection Successful!");
                        oServiceProxy.Retrieve("account", userid, new ColumnSet("name"));
                    }
                }
                else
                {
                    Console.WriteLine("Connection failed...");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error - " + ex.ToString());
            }

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提前谢谢

从WhoAmIRequest中获取的用户ID属于systemuser实体，而不是account实体

oServiceProxy.Retrieve("systemuser", userid, new ColumnSet("fullname"));

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从WhoAmIRequest获得的用户ID属于systemuser实体，而不是account实体

oServiceProxy.Retrieve("systemuser", userid, new ColumnSet("fullname"));