I am a Ubisoft+ subscriber and when I press SYNC or RESYNC in the GeForce NOW app, not all Ubisoft+ games are added to my library. How do I fix that?

With Ubisoft+ games, the SYNC feature will only add games to your GeForce NOW library that are in your Ubisoft Connect PC library.  GeForce NOW members can simply launch a supported Ubisoft+ game on GeForce NOW and it will be added to your GeForce NOW My Library.