When I launch Roller Champions on GeForce NOW I am asked to enter an activation key. How do I activate the game?

Users can visit this website https://rollerchampions.com/download-pc, login with your Ubisoft Account, select the Ubisoft Connect PC gaming platform.   Once that is done, go back to your GeForce NOW app and launch the game using the same Ubisoft Account login.

Alternatively, user with access to a Windows PC and a Ubisoft Connect app can download the game to activate it for play on GeForce NOW.