Galaxy s7 won't notify me of any notifications while on the phone

[Android Central Question]

So whenever I'm onthe phone I have to check my phone periodically to see if I have any text messages, or Facebook messenger, I don't even get the LED flashing to let me know i have notifications. This all started after the oreo update, it worked fine on nougat. Please help. Thanks in advance

 

[SilentEnVY]

Good question