Hi there NonKuffar,
Sorry to hear you cant access your game yet. Would you be able to try these steps for me first -
If you have just bought the game, it may take up until 24 hours to appear in your game launcher. I would recommend waiting 24 hours then trying the following steps -
When launching a Ubisoft game from Steam, it will first ask you to log in to the Uplay launcher with your Ubisoft account name, to link your Uplay account with your Steam account.
If your game launches and asks for a CD Key you do not have, please try the following -
In Steam, right-click on the game in the Library tab and select View Game CD Key, then enter the Key when it asks for it.
Please try the steps above, then we can look into this further for you.