The same thing happens with snapchat and instagram face filters when in lowlight areas but surprising to hear the X struggles, being it has the 3D sensing infra red front cam.
Yeah I was testing it with just my bedroom light on the night stand at the end of the light. And it kept saying low light, and wouldn’t work. And like I said before, at times. Depending on what facial expressions you make. Even with perfect lighting, it seems to struggle to mimic your facial expressions.