Hey @kathryn-forsythe, I stopped maintaining GitHub - klutchell/balena-traefik: traefik stack for balenaCloud to proxy https domains to interna a while back and it should probably be archived. Mostly because it required so much manual editing of files and reading the Traefik documentation.
Something I’ve been using more recently with success, and that has support for websockets, is Nginx Proxy Manager. It provides a helpful webUI on port 81 to allow configuration of reverse proxies. Might be worth giving this a try?