public async Task <IActionResult> JoinLobby([FromBody] JoinLobbyRequest request) { Guid lobbyId = _registry.JoinLobby(request.HostId, request.JoineeId); ServerSidePlayer joinee = _registry.GetPlayerById(request.JoineeId); List <ServerSidePlayer> members = _registry.GetLobbyMembers(request.HostId); await _hubContext.Clients.Group(lobbyId.ToString()).NewPlayerInLobby(new ServerSidePlayerOverview { Id = joinee.Id, AvatarUrl = joinee.AvatarUrl, Name = joinee.Name, }); return(base.Ok(new JoinLobbyResponse { LobbyId = lobbyId, Members = GetOverviewFromPlayer(members) })); }