Chosen Solution

Every other notification sound works but whatever I try I can’t get my message alert to work,any ideas

If you can get messages but just not the notifications, you may have accidentally blocked messages/hangouts from sending notifications. Try going to settings>notifications>app notifs>messages/hangouts/whatever your messaging app is. Then reset all the settings to allow.

I can still access messages but never see a notification. None of these suggestions above have been helpful. In other words I can still read The message by going into the Messages app but I never am alerted to the fact that I have a new message.