Assuming you have used the same uplay account on both the site and the console, it will transfer over automatically when unlocked
You can check they are the same, by checking the Initiates panel shows the correct details on the main menu - if it does - all is well!
Sure i'm using the same acc on both. Didn't know it'll happen automatically, so i guess it should be ingame already. It gets harder from year to year to keep an overview. Codes everywhere, exclusive (which partly aren't) contents, websites with or without codes and items, preorder, season pass, apps... I'm gettin' too old for this.