White notification LED not working in Nougat Somehow none of my notifications seem to trigger the flashing white LED on my Moto G5 running Nougat. 

On my past Android phones I remember the white LED to be a convenient way to know I had something waiting for me (e.g. a missed call or a whatsapp message) especially when my phone was placed a bit far away.

Is there some global setting I must enable for the white LED to be active?  

e.g. I checked Whatsapp and its settings do show "Light->White" as enabled under notifications.

Anything else I can check? 

PS. Is the White LED setting granular? i.e. Can I control which notifications trigger the white light?
Go to Settings-> Notifications-> Tap on settings symbol on top. 

Under Lights check whether notification light pulse is enabled or not. 
Also you can set custom notification colors, 

Goto Notification light section(down), Inside that, under General section, check whether notification light enabled or not.

Under Advanced section, tap on use custom values, which enables a + on top-right, click on it, select WhatsApp and enable a custom value for notification light.
(These settings from Nougat 7.1.2 )