Link your Twitch account to your Ubisoft account
Watch a participating Rainbow Six Siege Twitch stream that offers the Jynxzi Charm drop
Make sure the stream has Twitch Drops enabled
Watch for the required amount of time until the drop is earned
Claim the drop in your Twitch Drops inventory
Launch Rainbow Six Siege with the linked Ubisoft account
Check your in-game inventory for the Jynxzi Charm
If it does not appear, restart the game and relink accounts if needed