I have been using cortana to wake up the last week by saying "wake me up at x am." What I didn't know is that there is a new alarm created each and every time you do that. This happens regardless if it exists or not. So I open alarms and see over 9 one time only alarms defined most of them for 6am. Cortana should recognize that I already have a 1 time alarm defined for that time and simply turn it on. Hopefully this is fixed in June.