How to properly pass input arguments to a sub-orchestration function?

[dsaffie]

I have not yet been able to pass input arguments to sub-orchestration functions in my Azure Durable Function. I've looked at and duplicated the example here but this did not work. The example does not show how the sub-orchestration functions accesses the input so possibly that is where I am going wrong. I have a sub-orchestration function like:

@app.orchestration_trigger(context_name="context")
def sub_orchestrator(context: df.DurableOrchestrationContext):
    print(context.get_input())
}

I call it from the orchestrator like:

@app.orchestration_trigger(context_name="context")
def my_orchestrator(context: df.DurableOrchestrationContext):
    input_data = {"input": "123"}
    task = context.call_sub_orchestrator("sub_orchestrator", input_data)
}

This will end up printing None. What is going wrong here?