Function Calling returning 400 using example from the documentation about python-aiplatform HOT 1 OPEN

# Define a tool config for the above functions
retail_tool_config = ToolConfig(
    function_calling_config=ToolConfig.FunctionCallingConfig(
        # ANY mode forces the model to predict a function call
        mode=ToolConfig.FunctionCallingConfig.Mode.ANY,
        # List of functions that can be returned when the mode is ANY.
        # If the list is empty, any declared function can be returned.
        allowed_function_names=["get_product_sku"],
    )
)