The first thing you should do here is completely close (meaning – quit altogether) the game and try launching it again. If that doesn't work, another solution that often helps with these connectivity issues is to restart your device. It should also be pointed out that Ubisoft recommends that you play on a wired internet connection, so you should try this as well. If you are playing on an Xbox or PlayStation device, you should also check to see if your Xbox Live or PlayStation Network account is correctly linked to your Ubisoft account. Unlinking and then relinking your console account to your Ubisoft account again could also help. Changing your Ubisoft account password is also being reported as a fix in some cases.