Portainer 404 page not found

[modparts]

Hello,

I have set up my docker stack with Traefik 3 & Authentik, everything is working great only i can't access Portainer with portainer.mydomain.com, i keep getting 404 page not found in my browser. It works with IP-ADDRESS:9001 internally but not through the domain.

Can you please help me.

portainer.yml:

services:
  # Portainer - WebUI for Containers
  portainer:
    container_name: portainer
    image: portainer/portainer-ce:latest # Use portainer-ee if you have a Business Edition license key
    security_opt:
      - no-new-privileges:true
    restart: unless-stopped
    # profiles: ["core", "all"]
    networks:
      t3_proxy:
        ipv4_address: 192.168.90.240 # You can specify a static IP
      socket_proxy:
    # command: -H unix:///var/run/docker.sock # # Use Docker Socket Proxy instead for improved security
    command: -H tcp://socket-proxy:2375
    ports:
      - "$PORTAINER_PORT:9000"
    volumes:
      # - /var/run/docker.sock:/var/run/docker.sock:ro # # Use Docker Socket Proxy instead for improved security
      - $DOCKERDIR/appdata/portainer/data:/data # Change to local directory if you want to save/transfer config locally
    environment:
      - TZ=$TZ
    labels:
      - "traefik.enable=true"
      # HTTP Routers
      - "traefik.http.routers.portainer-rtr.entrypoints=websecure"
      - "traefik.http.routers.portainer-rtr.rule=Host(`portainer.$DOMAINNAME_1`)"
      - "traefik.http.routers.portainer-rtr.tls=true"
      # Middlewares
      #- "traefik.http.routers.portainer-rtr-bypass.middlewares=chain-no-auth@file"
      #- "traefik.http.routers.portainer-rtr.middlewares=chain-oauth@file"
      - "traefik.http.routers.portainer-rtr.middlewares=chain-authentik@file"
      # HTTP Services
      - "traefik.http.routers.portainer-rtr.service=portainer-svc"
      - "traefik.http.services.portainer-svc.loadbalancer.server.port=9000"


In the .env file  DOMAINNAME_1, PORTAINER_PORT & TZ are set correctly.
The cloudflare CNAME portainer is also created.