Pyodide kernel not showing up

I am encountering the same problem documented in this [closed issue](https://github.com/jupyterlite/jupyterlite/issues/1312). I have tried the recommendations in the thread and still cannot see the kernel when loading the app.

Some additional notes:
- JL is being served on an AWS EC2 instance.
- We are using nginx as a reverse proxy to forward load balancer requests to JL's URL.
- Serving via `jupyter lite serve` command.

I don't know if this is related, but the output from `jupyter lite status` shows:
```
. status:jupyterlite-pyodide-kernel-pyodide:pyodide
URL: None
```

Should the URL be populated?