Fritzbox with docker compose and traefik and subdomains not working

Traefik Traefik v2 (latest)
,
1

Hello. I'm from germany - so sorry for bad english explanations.
This is my setup :
I hav a FritzBox, in my local network a raspbarry with. On the raspberry I installed docker with traefik and a test container.
I can reach my fritzbox over the internet. Lets say the adress of the fritzbox ist https://example.myfritz.net
I confoigured the portforwarding to the raspberry pi, for the ports 80 and 443.
This is my docker file :

version: '3.9'

services:
  ################################################
  # TRAEFIK SERVICE
  ################################################
  traefik:
    image: traefik:latest
    container_name: traefik
    command:
      - "--log.level=INFO"
      - "--api.insecure=true"
      - "--providers.docker=true"
      - "--providers.docker.exposedbydefault=false"
      - "--entrypoints.websecure.address=:443"
      - "--certificatesresolvers.myresolver.acme.tlschallenge=true"
      - "--certificatesresolvers.myresolver.acme.email=mypersonal@email.de"
      - "--certificatesresolvers.myresolver.acme.storage=/letsencrypt/acme.json"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.traefik=true"
      - "traefik.http.routers.traefik.tls=true"
      - "traefik.http.services.traefik.loadbalancer.server.port=8080"
    ports:
      - 80:80
      - 443:443
      - 8080:8080
    restart: unless-stopped
    volumes:
      - "./letsencrypt:/letsencrypt"
      - "/var/run/docker.sock:/var/run/docker.sock:ro"

  ################################################
  # TEST SERVICE
  ################################################
  whoami:
    image: containous/whoami
    container_name: whoami
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.whoami.rule=Host(`whoami.example.myfritz.net)"
      - "traefik.http.routers.whoami.tls=true"
      - "traefik.http.routers.whoami.entrypoints=websecure"
      - "traefik.http.routers.whoami.tls.certresolver=myresolver"
    depends_on:
      - traefik

I tryied to read the website whoami.example.myfritz.net but in the browser I got site not available. I also tried to comment out the tls resolver - but the same result.
Has anybody an idea

2

Not sure what this is:

Your whoami is listening on websecure (https), but you access it with http and have no forward to https defined.

Check this simple Traefik example.