Possible causes
If you've tried all these steps and still encounter the error, consider contacting Ubisoft Support directly. They can provide more personalized assistance and might be aware of a specific issue affecting your account or game.
Are you launching via ?
Try disabling the "In-game overlay" within the Ubisoft Connect settings. This often bypasses the need for the game to call that specific achievement function during startup. step-by-step instructions for verifying your files on a specific platform like Ubisoft Connect
If the error persists, the game's local link to the launcher might be broken. Open the Ubisoft Connect Desktop App. Go to the tab and select your game. Click Properties on the left menu and select Verify files . 3. Check for Antivirus Blockages