Docker-compose + Traefik

Has anyone got a working setup of this combination? I somehow can't get things to work

I can run the below on the docker host sucessfully:

curl -d "Backup successful 😀" localhost:81/test  
{"id":"4EpidFddbe8p","time":1688997266,"expires":1689040466,"event":"message","topic":"test","message":"Backup successful 😀"}

…but when I try the public url from a different machine I get a 404 page not found. Which to me means ntfy is running, but there's something wrong with my Traefik setup.

docker-compose.yml

…
    ports:
      - 81:80
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.ntfy.rule=Host(`ntfy.mydomain.com`)"
      - "traefik.http.routers.ntfy.tls=true"
      - "traefik.http.routers.ntfy.entrypoints=http"
      - "traefik.http.routers.ntfy.entrypoints=https"
      - "traefik.http.routers.ntfy.tls.certresolver=http"
      - "traefik.http.services.ntfy.loadBalancer.server.port=81"
      - "traefik.docker.network=traefik-proxy"
      - "traefik.http.routers.ntfy.service=ntfy"

Minimalistic server.yml:

cat config/server.yml 
# ntfy server config file
base-url: "https://ntfy.mydomain.com"
  #upstream-base-url: "https://ntfy.sh"
  #listen-http: "127.0.0.1:80"
cache-file: "/var/cache/ntfy/cache.db"
  #attachment-cache-dir: "/var/cache/ntfy/attachments"
behind-proxy: true

Can anyone spot a mistake here or suggest additional troubleshooting steps?

---- Edit: Never mind, Traefik has given me so much grief, my brain doesn't seem to be compatible :-), that I decided to switch to nginx. Got everything running after 5 minutes…