My led indicator light isnt working

I noticed the led indicator light isnt working when i recieve messages or notifications with aps(the ones i have enabled)nor is it working when i have low battery.. it IS working when the phone is turned on or off and when its charging/is charged.
I have made sure the toggle switch is on and i have restarted my.phone numerous times... but still nothing?Can someone please help!
Its a galaxy s7.

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