419 PAGE EXPIRED after use Proxy

I have a Laravel application that has worked so far. The @csrf are all set.

Now I have created a Docker container with nginx and PHP, and have connected the container to a domain via an nginx proxy.

  php:
    image: php:8.3-fpm-alpine
    container_name: php
    volumes:
      - ./html:/var/www/html
    restart: unless-stopped

  nginx:
    image: nginx:latest
    container_name: nginx
    volumes:
      - ./default.conf:/etc/nginx/conf.d/default.conf:ro
      - ./html:/var/www/html
    ports:
      - 1234:80
    restart: unless-stopped

My default.conf

server {
    listen 80;
    index index.php index.html;

    server_name _;
    root /var/www/html/public;
....
}

my .env

APP_URL=https://my.domain.tld
SESSION_DOMAIN=my.domain.tld
SESSION_SECURE_COOKIE=false

I have also tried to add this in bootstrap/app.php

    ->withMiddleware(function (Middleware $middleware) {
        $middleware->trustProxies(at: [
          '*',
        ]);
    })

What have I forgotten, or what am I not seeing right now?