Win32_EncryptableVolume类的ProtectKeyWithTPM方法导致异常

我想尝试使用Win32_EncryptableVolume类的加密方法加密包含操作系统安装的逻辑磁盘卷。在我使用这种方法之前，我必须创建一个密钥来保护这个卷，为此我有几个选项，但如果我想加密包含操作系统安装的逻辑磁盘卷，我必须使用ProtectKeyWithTPM方法。

当我尝试调用ProtectKeyWithTPM方法时发生问题，它返回给我以下堆栈跟踪:

System.Runtime.InteropServices.COMException (0x800706BE)
    em System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    em System.Management.ManagementObject.InvokeMethod(String methodName, ManagementBaseObject inParameters, InvokeMethodOptions options)
    em ListDrivers.BitLocker.callMethod(String method, ManagementObject privateLateBoundObject, ManagementBaseObject inParams) na C:'Users'admin'documents'visual studio 2015'Projects'BitlockerTeste'BitlockerTeste'BitLocker.cs:linha 221
    em ListDrivers.BitLocker.defineTPM(String id, ArrayList drivers) na C:'Users'admin'documents'visual studio 2015'Projects'BitlockerTeste'BitlockerTeste'BitLocker.cs:linha 149
    em ListDrivers.Program.<TPMProtection>d__8.MoveNext() na C:'Users'admin'documents'visual studio 2015'Projects'BitlockerTeste'BitlockerTeste'Program.cs:linha 275
--- Fim do rastreamento de pilha do local anterior onde a exceção foi gerada ---
    em System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
    em System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
    em System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
    em ListDrivers.Program.<encryptMenu>d__7.MoveNext() na C:'Users'admin'documents'visual studio 2015'Projects'BitlockerTeste'BitlockerTeste'Program.cs:linha 241

这个错误只发生在这个方法上，所有其他Win32_EncryptableVolume方法正常工作，我已经在许多网站上搜索了这个解决方案，但我没有找到任何帮助。

我的问题是，当我试图用TPM保护卷时，为什么会发生这种情况?为什么其他不使用TPM的保护方法都能正常工作?

编辑:

defineTPM方法:

public static UInt32 defineTPM(string id, ArrayList drivers)
{
   String deviceId = findByDriverLetter(id, drivers);
   if (deviceId != null)
   {
       ManagementObject privateLateBoundObject = returnManagementObjectForDevice(deviceId);
       ManagementBaseObject inParams = null;
       return callMethod("ProtectKeyWithTPMandStartupKey", privateLateBoundObject, inParams);
   }
   return Convert.ToUInt32(2147942487);
}

callMethod方法:

private static UInt32 callMethod(String method, ManagementObject privateLateBoundObject, ManagementBaseObject inParams)
{
    ManagementBaseObject outParams = privateLateBoundObject.InvokeMethod(method, inParams, null);
    return Convert.ToUInt32(outParams.Properties["ReturnValue"].Value);
}

ManagementBaseObject inParams;
inParams = PrivateLateBoundObject.GetMethodParameters("ProtectKeyWithTPM");