GVR Reticle works in the editor but not in the actual app on phone

I am making an app where I am using the GVR reticle pointer to start playing a video on a sprite after I click on it. (Google Cardboard sdk for unity.) I have set up all the required components on the sprite (collider, event trigger, videoplayer, play() on PointerClick etc.). It works flawlessly inside the editor (with GVREditorEmulator included in the scene.) However, after building the same scene as an android app, the reticle pointer stops working on the phone. It just doesn't detect the sprite and expand the ring on hovering over it. Clicks don't work either. I have checked and double check if I am missing collider or event trigger. Could anyone shed light on this?