Check your Status Bar Settings in your Notification settings. From Settings, touch Notifications. Touch Status bar, and then adjust the desired settings.
Is this happening for all notifications ? It doesnt happen for me for messages and phone but for everything else my lock screen does not light up
Eg emails, what's app messages, what's app calls etc.
You cannot read the content of the notifications with the screen off entirely. Enable Double tap to wake. After a double tap, your lock screen will turn on. Then you can read your notifications. To enable double tap, go to Settings>Advanced features>Motions and gestures.
Right. I haven't played around with edge notifications
But yes on my lock screen, the screen wakes up only for default messages up and calls
On the bright side I don't burn too much battery on other apps notifications since they still show up on my notification bar and I can view them when I am checking my phone