xmlinterop.dll (64 bit) error code 14

I am working on using the 64-bit version of the xmlinterop.dll. I can only get "error code 14 - Connection to OneWorld failed".
I've tried sending in bad xml, bad username/password, to force a different error, but only get error 14, which doesn't really tell me anything about why it's not getting through.

We have an old C++ solution working with the 32-bit dlls; but upgrading to C# & 64-bit dlls. I can use our old solution and get accurate responses, so I know the server is accepting xml...

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