Do I need a Ubisoft Connect account to play Ubisoft games on Blacknut?

Yes - To play Ubisoft streaming games on Blacknut, you will need to link your Blacknut account to an existing Ubisoft Connect account or create one. (for more information, please visit ubisoft's Ubisoft Connect website)
In some cases, you'll be able to enjoy the benefits of cross-platform progression, and find your backups between Blacknut and other Ubisoft Connect-compatible platforms.
Cross-progression availability varies from game to game and platform to platform. More information on the Ubisoft website.

Find the Ubisoft+ Classics Pass games and Bonus Games you've unlocked on the Ubisoft Connect application available on PC.