Check out the latest blog on Boss Room which has been updated to release v1.1.0-pre and boasts a whole new feature set for developers looking to explore the services side of multiplayer game development!
This multiplayer sample game features a variety of UGS in a production-ready environment for developers to learn about multiplayer game development. Let me know if this helps you get started: Enter the Boss Room in 2022: Netcode for GameObjects, Relay, and Lobby
maybe move this to announcements or something. Improving the authentication and connection example is a big add and if this project is our primary example it would be great to have any changes made to it “officaly” announced. 
Reading the blog. Is ParrelSync officially supported by unity? Our methodology for local testing is to use symbolic links. Seams this is a shortcut for that? If this isn’t official are their plans to make an official local multiplayer testing solution?
ParrelSync is not officially supported by Unity and you are right it is just a shortcut for that. We are working internally on some first party ways to improve local iteration flows.