Connection approval unity netcode for gameobjects

Hello! Im quite new to unity and even newer to multiplayer coding. i had problem with sending data from not connected client to server while they are connecting and someone on discord told me about connection approval. I think its exacly what im looking for but i dont understand how to use it, and i cant find a lot of informations on this topic. could you guys explain it to me and how to use it. should those classes be mono or network behaviour and how to do different thinks with that. if its needed i can send my codes and explaint more exacly what im trying to do.

The documentation explains it quite well, there’s also a practical example here. After looking at those post back if there’s anything you’re unsure about.