Since Steam lets you put your username on almost anything, it isn’t easy to make friends when discussing names with others. Therefore At that time, you can use a friend code to find them. This MiniTool article explains how to find and add a Steam Friend Code.

Therefore In some games, if you entered a random lobby, you are playing with strangers. What you do if you want to play with them again? You’ll need to find the Steam friend code to add them, and then you can play with them again.