eMedNy Soap Interop：资格错误

Question

我一直致力于设置Soap客户端，以便根据instructions使用eMedNy的服务。

这就是我目前正在做的事情：

string _270Msg = "..."; // 270 Message 

// convert string to array of bytes
byte [] bytes = new byte[_270Msg.Length * sizeof(char)]; 
System.Buffer.BlockCopy( _270Msg.ToCharArray(), 0, bytes, 0, bytes.Length );

// Wrap bytes in eMedNy-supplied Transaction Type
Transaction t = new Transaction();
t.transData = bytes;

client.getEligibility( t );

我相信我的消息已成功通过他们的安全门，但我现在从他们的服务器收到以下错误消息：

An unsecured or incorrectly secured fault was received from the other party. See
inner FaultException for the fault code and detail. ---> 
System.ServiceModeultException: Eligibility
--- End of inner exception stack trace ---

有没有人有经验可以指导我如何解决这个问题？