For those who are having problems connecting to Rainbow Six Siege, it’s not just you, as Ubisoft acknowledged the problem with the Rainbow Six Siege servers on January 20th.
Status and updates of the Rainbow Six Siege servers for January 20:
Here’s Ubisoft’s announcement regarding the hiatus:
Above the games subreddit, there have been multiple reports regarding the servers. While the servers are out, go read about the latest title update that came out this week.
As soon as more news about the servers becomes available, we will update the article accordingly.
source: Ubisoft forums