Tom Clancy's Rainbow Six Siege X

On TWITCH.TV log out of your account and log into purchased twitch account
If twitch asks you for a code from the mail then press "remind later", "cross" or F5 on your keyboard.

Follow the link drops-register.ubi.com/login, click the "LOGIN" button, then connect your game account.
Everything is ready, you can take the reward in the game (packs are not displayed on the R6 website). If it doesn't come within 10 minutes, reconnect the twitch. After receiving the items, you can untie the twitch account, the items will not be lost.