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I think the problem is that your application's container port is not specified anywhere. So the AWSX library is deriving the port based on the protocol (HTTPS) for the target group. You might try creating a target group first and then create a listener from that target group. That is,

const targetGroup = lb.createTargetGroup("...", {..., port: <your container port>});
const httpsListener = targetGroup.createListener("...", {protocol: "HTTPS"});