This error appears when you are logged into the wrong Ubisoft Connect account while launching our game through Steam.
To fix this issue:
• In Ubisoft Connect, select your account username in the top-right corner.
• Select Log out.
• Enter the login details of the account your game is activated on.
• Try launching your game again through Steam.
You should now be able to run the game.
If you are unsure which Ubisoft account your game is activated on or have any other questions, please get in touch