Gitlab self hosted: Trigger 422 Error

So I continue to investigate on my problem.
I found out that if I launch the docker compose with start --tunnel command (inside the docker-compose file), the service works normaly.
I think it’s an issue on my side for the configuration but I don’t know what I do wrong. I tried to modify the different environment variable N8N_HOST and WEBHOOK_URL but nothing change.

I join you part of the docker-compose.

n8n:
    image: docker.n8n.io/n8nio/n8n:1.29.1
    restart: always
    ports:
      - "127.0.0.1:5678:5678"
    labels:
      - traefik.enable=true
      - traefik.http.routers.n8n.rule=Host(`${DOMAIN_NAME}`)
      - traefik.http.routers.n8n.tls=true
      - traefik.http.routers.n8n.entrypoints=web,websecure
      - traefik.http.routers.n8n.tls.certresolver=ovh
      - traefik.http.middlewares.n8n.headers.SSLRedirect=true
      - traefik.http.middlewares.n8n.headers.STSSeconds=315360000
      - traefik.http.middlewares.n8n.headers.browserXSSFilter=true
      - traefik.http.middlewares.n8n.headers.contentTypeNosniff=true
      - traefik.http.middlewares.n8n.headers.forceSTSHeader=true
      - traefik.http.middlewares.n8n.headers.SSLHost=${DOMAIN_NAME}
      - traefik.http.middlewares.n8n.headers.STSIncludeSubdomains=true
      - traefik.http.middlewares.n8n.headers.STSPreload=true
      - traefik.http.routers.n8n.middlewares=n8n@docker
    environment:
      - N8N_HOST=${DOMAIN_NAME}
      - N8N_PORT=5678
      - N8N_PROTOCOL=https
      - NODE_ENV=production
      - WEBHOOK_URL=https://${DOMAIN_NAME}
      - GENERIC_TIMEZONE=${GENERIC_TIMEZONE}
      - N8N_LOG_LEVEL=debug
    volumes:
      - n8n_data:/home/node/.n8n

Does anyone have the same issue?