If you already own a game on Steam or Epic Games but the Ubisoft Connect PC launcher is asking for a key, it is likely a syncing error rather than a missing code.
Using third-party "cracks" to bypass activation is highly discouraged for several reasons: Ubisoft Activation Key Crack
Rather than resorting to using a Ubisoft Activation Key Crack, gamers can explore alternative options to access Ubisoft games: If you already own a game on Steam