For those having problems connecting to Rainbow Six Siege, it’s not just you, as Ubisoft has acknowledged the Rainbow Six Siege servers down issue this January 20.
Rainbow Six Siege Servers Down Status and Updates for January 20:
Here’s the announcement from Ubisoft regarding the outage:
Hello everyone. We’re aware of an issue currently affecting connectivity in Rainbow Six Siege and are working towards resolving this. We apologize for any inconvenience caused and appreciate your patience. Please be sure to check this thread for future updates. Thanks.
In addition to that, Ubisoft has also acknowledged the issues regarding friend invites.
Hello everyone. We’re aware of issues affecting friend and group invites and are working towards resolving this. We apologize for any inconvenience caused and appreciate your patience. Please be sure to check this thread for future updates. Thanks.
Source: Ubisoft forums