Consider yourself very lucky then.I've played a lot of Anno 2070 in multiplayer back then, always worked flawlessly.
Just updated ED on Steam too, didn't have to re-confirm anything and no error of any sort.
Regarding Anno: Me and five other friends wanted to play one day. Even though all have updated the game through Uplay, we ended up with three different versions. Then for some the manual update couldn't be applied - a nightmare.