Yeah, that thing is honestly impressive. If I didn’t already have a full network manager wg setup I’d just use that.

Reformatting that compose for people:

version: "2.1"                                                services:
  wireguard:
    image: linuxserver/wireguard
    container_name: wireguard
    cap_add:
      - NET_ADMIN
      - SYS_MODULE
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Asia/Singapore
      - SERVERURL=auto #optional
      - SERVERPORT=51820 #optional
      - PEERS=1 #optional
      - PEERDNS=auto #optional
      - INTERNAL_SUBNET=10.13.13.0 #optional
    volumes:
      - ./config:/config
      - /lib/modules:/lib/modules
    ports:
      - 51820:51820/udp
    sysctls:
      - net.ipv4.ip_forward=1
      - net.ipv4.conf.all.src_valid_mark=1
    restart: unless-stopped

Sounds like you didn’t read the extended manual: https://github.com/linuxserver/docker-wireguard

There are a lot of other configs for that container that must be provided before startup. It’s just a generic runner. If you want it to run as a server you need to follow this section: https://github.com/linuxserver/docker-wireguard?tab=readme-ov-file#server-mode

Are you at getting the handshake in the app? If so, you’re probably just missing the dispatch commands for traffic masquerading.