How can I get my HTC One M9 notifications working?

[AC Question]

Htc one m9 no notifications are working

So recently I noticed my notifications stopped working. Emails, texts, alarms, facebook messages, etc. All the volume is turned up, I tried a speaker cleaner and restarted the phone and that worked the first time, but now its happened again, and speaker cleaner isn't fixing it. HELP! I need my alarms to wake me up in the morning. Haha

 

[B. Diddy]

Welcome to Android Central! Is it playing media normally? Can you hear people talking to you over speakerphone? Do you see the notification icons appear in the status bar?

Does the problem persist in Safe Mode? https://support.t-mobile.com/docs/DOC-20834