Hey for anyone that plays on the Vive or the Oculus, for some reason the "Trigger" binding did not stick (which is required to pass the first gesture taught to you by Sensei). You'll need to bind it in your SteamVR settings.
Edit: I did some digging and apparently I did not press the "replace default bindings" when I created the bindings. If you don't want to / can't use SteamVR to bind the Trigger button you can download a patch to fix the issue at Disciples of Elemental Harmony - Controller Fix.