Thank you for contacting Ubisoft Technical Support regarding Assassin's Creed: Revelations.
In order to respond to this email, please update this incident (Please do not create a new incident)
Regarding your issue with not being able to login to your game, we've performed server maintenance and that might be the cause of why you haven't been able to login to the game, please try to login to the game again.
We apologize for this inconvenience caused.
If you have any further queries or issues please do not hesitate to contact us again and we will assist you further.
Ubisoft Technical Support.