Has anyone else had this problem where the notification led colors no longer show up?
I can see the led colors when im charging the phone = red
And when fully charged = green
But messages used to be flash blue
WhatsApp used to flash purple.
Now it doesnt flash any color to notifiy me that I have a message when my screen isnt on
Try placing your device in safe mode to see if you receive any lighting from your messages. If so try uninstalling Whatsapp and trying again.
There is nothing you can do to fix this so don't bother trying. If you turn on Edge Lighting you will get a flashing blue light for messages, I also rarely get a flashing green light for a missed phone call but 90% of the time I get nothing. Samsung will (hopefully) come out with a fix for this eventually but I can't tell you when, it is a S9 series problem after upgrading to Android 10.
I have had the same issue for about a year. Some apps work and some don't. Most notably I stopped getting notification light for Gmail. Samsung and Google have never been able to resolve...