Cannot get calls to work with dynamic variables

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Hey folks I cant seem to get calls to work when I start to use dynamic variables in my Python application. When I start my python application it starts fine and receives the call just fine. When I start to try and configure dynamic variables the call never reaches the agent and the call hangs up. There is no errors or anything in my account.
code attached

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argh. My mistake was I had dynamic variables in my first prompt message. So me adding dynamic variables to the class "conversationconfig().extra_body" was not correct. New code:

        conversation_config_override={
            "agent": {
            "first_message": f"Hi there! How can I help you today? {call_sid} ,{from_number} ,{caller_name}"}
            }
        )
    conversation = None

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So actually I was .1 version off for the eleven labs library. pip was not updating it to the most recent one and had to manually specify the version. It works now.