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Although I have an R6 game, I bought another R6 game from the store, how can I return it or use it as a smurf 
Hey Roguex.R6, welcome to the forums.
Just so you are aware a player can have more than one Ubisoft Account at the moment, but using those accounts to smurf foes against our Terms of Use for those accounts and can result in you account being closed if reported.
If you would like to return your game,it should give you the option to so this within the store for your recent purchase and orders page - https://store.ubi.com/uk/my-account#...-order-history