Auto Dimming not working

My moto g4 is not auto dimming (at dark) or going to full brightness (in sunlight) automatically

I checked and the sensor seems to be working (using a lux app)

Any idea what's going on?


Thanks!

Screen dimming when watching video recorded via phone?

I recorded a video recently and noticed when I went to watch it that the screen dims dramatically. Happens with with all the videos a recorded. I found this very odd. Is this normal?