In this video I explore how to use the Steamworks Lobby to our advantage. Using the Steam Lobby makes matchmaking a lot easier. Implement a series of events, connect them to your UI and you're ready to go.
The code is posted here:
https://github.com/Goodgulf281/Unity-Mirror-Helper-Scripts
Note: as stated in the video this code heavily leans on 3rd party components so use it for inspiration only.