'"Write" Transactions don't work when using C#/Node.js with Amazon Neptune

I am able to connect to Neptune and was able to add some data to it with no issues. However, when I tried the code at https://tinkerpop.apache.org/docs/current/reference/#gremlin-dotnet-transactions it doesn't seem to work. I receive following error:

"Received data deserialized into null object message. Cannot operate on it."

I even jumped to a JS sample (https://tinkerpop.apache.org/docs/current/reference/#gremlin-javascript-transactions) and tried again. It doesn't work either.

What am I missing?

c++sharpnode.jsamazon-neptune


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