This means that public lists of serial numbers are almost always "dead" or already redeemed. Using these keys will result in an "Invalid Key" or "Key Already in Use" error message. Furthermore, downloading "key generators" or "cracks" from unverified sources to bypass this system poses a significant security risk to your computer, often leading to malware or phishing attempts. Why a Valid Serial Key is Necessary

The serial numbers found on public lists are scraped from old retail boxes or copied by multiple users. If the Ubisoft authentication servers detect the same product key attempting to log in from different accounts or geographic locations, the system automatically blacklists and flags that key as fraudulent. The Hidden Risks of Key Generators and Crack Lists

Click the (Manage) on the right side of the game's page.

: You can find legitimate keys on platforms like Steam or Epic Games Store .