So, sorry for having written my bug report in french. Here it is in English:

1. I'v sent a friend request to a friend. He Added me too in his friends list, but we are unable to play together. When I go to the camp in Online mode, and I go to the friends list, it says that he hasn't accepted me yet. But, as said before, He added me already. (And he sees me offline)
2. It is my brother now : He can't play online. when he tries to click on the button "play online", it says that he hasn't the permission, exact error message: privilege error… So he can only play offline, and so, everyone is playing alone thank you for you time, and sorry for my bad english !