How to properly configure Nginx proxy in docker-compose.yml

I use Ubuntu with docker and I need to set up my local server with Nextcloud and Openproject. For connection form internet(outside) I use dynamic DNS (ddns.net service). When I use this connection in localhost it works. But nothing works from outside. But my nginx is reachable because I get 503 error. My ddns adress is mydomain.ddns.net

Desired redirection is:

openproject.mydomain.ddns.net ==> openproject container
nextcloud.mydomain.ddns.net ==> nextcloud container

I am not able to properly configure nginx proxy container to redirect to container. I have this docker-compose.yml file:

version: '3' 

services:

  proxy:
    image: jwilder/nginx-proxy:alpine
    labels:
      - "com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy=true"
    container_name: nextcloud-proxy
    networks:
      - nextcloud_network
    ports:
      - 80:80
      - 443:443
    volumes:
      - ./proxy/conf.d:/etc/nginx/conf.d:rw
      - ./proxy/vhost.d:/etc/nginx/vhost.d:rw
      - ./proxy/html:/usr/share/nginx/html:rw
      - ./proxy/certs:/etc/nginx/certs:ro
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/tmp/docker.sock:ro
    restart: unless-stopped
  
  letsencrypt:
    image: jrcs/letsencrypt-nginx-proxy-companion
    container_name: nextcloud-letsencrypt
    depends_on:
      - proxy
    networks:
      - nextcloud_network
    volumes:
      - ./proxy/certs:/etc/nginx/certs:rw
      - ./proxy/vhost.d:/etc/nginx/vhost.d:rw
      - ./proxy/html:/usr/share/nginx/html:rw
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/var/run/docker.sock:ro
    restart: unless-stopped

  db:
    image: mariadb
    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW --innodb-file-per-table=1 --skip-innodb-read-only-compressed
    container_name: nextcloud-mariadb
    networks:
      - nextcloud_network
    volumes:
      - db:/var/lib/mysql
      - /etc/localtime:/etc/localtime:ro
    environment:
      - MYSQL_ROOT_PASSWORD=pass
      - MYSQL_PASSWORD=pass
      - MYSQL_DATABASE=nextcloud
      - MYSQL_USER=nextcloud
    restart: unless-stopped
  
  app:
    image: nextcloud:latest
    container_name: nextcloud-app
    networks:
      - nextcloud_network
    depends_on:
      - letsencrypt
      - proxy
      - db
    volumes:
      - nextcloud:/var/www/html
      - ./app/config:/var/www/html/config
      - ./app/custom_apps:/var/www/html/custom_apps
      - ./app/data:/var/www/html/data
      - ./app/themes:/var/www/html/themes
      - /etc/localtime:/etc/localtime:ro
    environment:
      - VIRTUAL_HOST=nextcloud.mydomain.ddns.net
      - LETSENCRYPT_HOST=nextcloud.mydomain.ddns.net
      - [email protected]
    restart: unless-stopped
    
  app2:
    image: openproject/community:11
    container_name: openproject-app
    networks:
      - nextcloud_network
    depends_on:
      - letsencrypt
      - proxy
      - db2
    volumes:
      - openproject:/var/www/html
      - ./app/config:/var/www/html/config
      - ./app/custom_apps:/var/www/html/custom_apps
      - ./app/data:/var/www/html/data
      - ./app/themes:/var/www/html/themes
      - /etc/localtime:/etc/localtime:ro
    environment:
      - SECRET_KEY_BASE=secret
      - VIRTUAL_HOST=openproject.mydomain.ddns.net
      - LETSENCRYPT_HOST=openproject.mydomain.ddns.net
      - [email protected]
    restart: unless-stopped

  db2:
    image: mariadb
    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW --innodb-file-per-table=1 --skip-innodb-read-only-compressed
    container_name: openproject-mariadb
    networks:
      - nextcloud_network
    volumes:
      - db2:/var/lib/mysql
      - /etc/localtime:/etc/localtime:ro
    environment:
      - MYSQL_ROOT_PASSWORD=pass
      - MYSQL_PASSWORD=pass
      - MYSQL_DATABASE=openproject
      - MYSQL_USER=openproject
    restart: unless-stopped

volumes:
  openproject:
  nextcloud:
  db:
  db2:


networks:
  nextcloud_network:

Thanks, for help :)