[can be deleted] wrong forum

Hi,

here is my docker-compose for invidious:

services:

  invidious:
    image: quay.io/invidious/invidious:latest
    container_name: invidious
    restart: unless-stopped
    networks:
      - proxy
      - invidious
    volumes:
      - /etc/localtime:/etc/localtime:ro
    environment:
      INVIDIOUS_CONFIG: |
        db:
          dbname: invidious
          user: kemal
          password: kemal
          host: invidious-db
          port: 5432
        check_tables: true
        external_port: 443
        domain: invidious.example.com
        https_only: true
        statistics_enabled: false
#        signature_server: inv_sig_helper:12999
        hmac_key: "jkhasjkhjkas"
        visitor_data: ilasjljaskl
        po_token: askjaklsj

    logging:
      options:
        max-size: "1G"
        max-file: "4"
    depends_on:
      - invidious-db
      - inv_sig_helper

    labels:
      - traefik.enable=true
      - traefik.docker.network=proxy
      - traefik.http.routers.invidious.entrypoints=https
      - traefik.http.routers.invidious.rule=Host(`invidious.example.com`)
      - traefik.http.routers.invidious.middlewares=ipwhitelist@file,secureHeaders@file
      - traefik.http.routers.invidious.tls=true
      - traefik.http.services.invidious.loadbalancer.server.port=3000

  inv_sig_helper:
    container_name: inv_sig_helper
    image: quay.io/invidious/inv-sig-helper:latest
    command: ["--tcp", "0.0.0.0:12999"]
    environment:
      - RUST_LOG=info
    restart: unless-stopped
    networks:
      - invidious
    cap_drop:
      - ALL
    read_only: true
    security_opt:
      - no-new-privileges:true

  invidious-db:
    image: docker.io/library/postgres:14
    container_name: invidious-db
    restart: unless-stopped
    networks:
      - invidious
    volumes:
      - postgresdata:/var/lib/postgresql/data
      - ./config/sql:/config/sql
      - ./docker/init-invidious-db.sh:/docker-entrypoint-initdb.d/init-invidious-db.sh
      - /etc/localtime:/etc/localtime:ro
    environment:
      POSTGRES_DB: invidious
      POSTGRES_USER: kemal
      POSTGRES_PASSWORD: kemal
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB"]

volumes:
  postgresdata:
networks:
  proxy:
    external: true
  invidious:
    internal: true

I can access invidious via: https://invidious.example.com

As soon as i uncomment the line:
# signature_server: inv_sig_helper:12999
i get a "Bad Gateway" error in my browser.
The invidious container logs show that the container sees and reaches the inv_sig_helper container.

I have no idea what the problem is. Can somebody help me?