Hy,
You didnt see the Elo in the Lobby list ingame but you see the Lobby`s on https://aoe2.net/#aoe2de-lobbies with the Ratings. When you click on ,+, you see the Elo from all players in the Lobby. When you click now on Join, it Join automatical in the Lobby ingame, it is not the best way but you see wich Elo have the Players in the Lobby.
I hope this help all Lobby-Players.
See you