When you add them, they are added to ‘Strangers.’ When they also add you to their friends list, then they are added to friends.
They are typically sent a ‘Friend Request’ button which allows them to add you to their list as well. That would allow you to become friends. If they’re new to the game or busy, they might have missed this – it isn’t a constant part of the interface, it typically only appears when there is a friend request. You could send them a message about it, if you know them from outside of the game. Hopefully you can get this resolved.
If this isn’t functioning, then it might be a technical issue or bug. However, you said that you were wondering how the Friends list functions normally.Last edited: 15.07.2020 08:44