After conducting extensive research on Steam, Steam ID 480 has no activated features.
The only activated feature is LOCAL WAN on the same network AND LAN, external WAN (P2P) is not an activated service on this ID.
To access the P2P service (Nat Traversal, WAN network splitting), you need your own Steam ID.
Unfortunately, I still haven’t found a solution for Epic Game, even though the lobby is clearly visible in the dashboard.