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Edit: I've noticed that you now have the game in your library. I hope you were able to solve your issue.
If you bought a key from anywhere outside of Steam for rainbow six, this is only for Ubisoft game client not Steam that it.
If you bought the game on Steam, you must download the Ubisoft connect client from Ubisoft website, and login to your existing Ubisoft account, then you can launch rainbow six from steam, it will ask if you wish to link your game to your Ubisoft account you click yes, and you must always use exact same Ubisoft account, and exact same Steam account as they're tie to each other for the game. Otherwise it will ask for a CD key.