https://www.pcgamer.com/rainbow-six-siege-players-who-enable-2-factor-authentication-will-get-this-free-skin/

A couple of weeks ago, Epic began offering a free Fortnite dance emote to anyone who enabled two-factor authentication on their account. With the rollout of Operation Grim Sky today, Ubisoft is offering the same carrot for Rainbow Six Siege players, who will receive a unique Thermite skin for switching it on.

Instructions for enabling 2FA on your account are available on the Ubisoft forum, and to be frank it's not as smooth and simple as the processes offered by other platforms, like Steam or Battle.net. You'll need to install the Google Authenticator app on your mobile, and since it's only available on Android and iOS devices, if you don't have one of those I guess you might as well just stop reading right now.