Node.JS method ".request(function(error,result)" works locally but will not work in AWS Lambda with Chargebee libraries

Question

Can anyone tell me why this methodology works locally but will not work in an AWS Lambda. Took us 2 days to figure out it was the request format. It is copied straight from Chargebee examples. I am a novice in Node.

await chargebee.customer.retrieve(customer_id).request(function(error,result) {
    if(error){
        //handle error
        console.log(error);
    }else{
        console.log(result);
        var customer = result.customer;
        var card = result.card;
    }
    });

But this method works fine in Lambda

var response = await chargebee.customer.retrieve(customer_id).request();

Using Node 16

I have no idea why it would execute differently unless AWS's Node 16 is different from the 16.13.0 we are using locally?