I can't seem to get AM to work in SteamVR. I've placed the image effect script on Camera (Eye), placed the AM Object script on my target object. Nothing happens. I've also tried lowering the velocity threshold and increasing the motion scale to get any effect.
It does, however work fine in a normal (non-vr) project that I have.
Thank you for your interest, we really appreciate it. Amplify Motion is not entirely recommend for VR applications but the effect should be visible. What Unity version are you currently using and do you happen to have similar issues with other image effects?