Why isn't the calendar that came with the phone notifying me?

A

AC Question

my calendar that came with the phone isn't notifying me

I have a Galaxy S6 and this is a new problem for about 1 week. I have noticed that when I enter an event into my calendar, I don't get a reminder unless I set a 10 minutes before notification. I don't get a calendar icon in the top left of the home screen or a note on my lock screen. My notifications are enabled in settings. Is there anything I can do on my own or do I have to take it back to the store I bought it from?