VMware vCenter API with C# - InitiateFileTransferToGuest fails - c#

I'm trying to use the InitiateFileTransferToGuest method to send a file to a VM. Unfortunately, I'm getting stuck. Here's the related code where VClient is the VimClient with an already successfull connection:
GuestOperationsManager VMOpsManager = new GuestOperationsManager(VClient, VClient.ServiceContent.GuestOperationsManager);
GuestFileManager VMFileManager = new GuestFileManager(VClient, VClient.ServiceContent.FileManager);
GuestAuthManager VMAuthManager = new GuestAuthManager(VClient, VClient.ServiceContent.AuthorizationManager);
NamePasswordAuthentication Auth = new NamePasswordAuthentication()
{
Username = "username",
Password = "password",
InteractiveSession = false
};
VMAuthManager.ValidateCredentialsInGuest(CurrentVM.MoRef, Auth);
System.IO.FileInfo FileToTransfer = new System.IO.FileInfo("C:\\userlist.txt");
GuestFileAttributes GFA = new GuestFileAttributes()
{
AccessTime = FileToTransfer.LastAccessTimeUtc,
ModificationTime = FileToTransfer.LastWriteTimeUtc
};
string TransferOutput = VMFileManager.InitiateFileTransferToGuest(CurrentVM.MoRef, Auth, "C:\\userlist.txt", GFA, FileToTransfer.Length, false);
First error shows up when getting to the ValidateCredentialsInGuest method. I get this message:
An unhandled exception of type 'VMware.Vim.VimException' occurred in VMware.Vim.dll Additional information: The request refers to an unexpected or unknown type.
If I remove that validation, I get the same error when trying to run InitiateFileTransferToGuest. I've been browsing the API documentation, and threads in VMware forums and a lot of places to be honest. The only pieces of code I've seen posted where it works were in Java and Perl, but the API implementation is a little different than C#. Any idea where to look?
Thank you!

I made it work after testing and making up stuff. I guessed the MoRef for both AuthManager and FileManager doing the following:
ManagedObjectReference MoRefFileManager = new ManagedObjectReference("guestOperationsFileManager");
GuestFileManager VMFileManager = new GuestFileManager(VClient, MoRefFileManager);
ManagedObjectReference MoRefAuthManager = new ManagedObjectReference("guestOperationsAuthManager");
GuestAuthManager VMAuthManager = new GuestAuthManager(VClient, MoRefAuthManager);
Now it's working, and I have no idea how.

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AmazonMachineLearningConfig MLConfig = new AmazonMachineLearningConfig();
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