aws nlb socket.io ssl via copilot - amazon-web-services

Question

Context
I'm trying to create a load balancer with AWS Copilot that runs socket.io instances.
Locally and in an HTTP environment, I can successfully connect to the socket instance via the load balancer (ws://{id}.elb.{region}.amazonaws.com:8080/socket.io/?EIO=4&transport=websocket).
Problem
When I'm in the HTTPS context and try to connect, it fails and I get the error message Error: Websocket error with no real error message or status code (wss://{id}.elb.{region}.amazonaws.com:8080/socket.io/?EIO=4&transport=websocket).
With ws:// everything works and in wss:// it does not work.
Code Snippets
AWS Copilot manifest.yml
name: websocket-service
type: Load Balanced Web Service
http:
path: '/'
healthcheck: '/health'
nlb:
port: 8080/tcp
Server
import {Server} from 'https'; // I use HTTPS here
// ...
this._io = socketIo(server);
// ...
Client
// ...
const client = socketClient(url, {
transports: ['websocket']
});
// ...
AWS Console
EC2 -> Load Balancing -> Load Balancers -> {target} -> Listeners