Trouble adding Flex Monthly schedule

I have an existing Fixed schesule watering 3 zones, newly sodded front lawn. 15 min duration/zone, 1 hour interval, run all day.

I added a Flex Monthly schedule for the rest of the older lawn, 2 zones. This schedule will not run. It says no upcoming watering. It is 15 min for each zone, 1 hour interval, end before sunrise. I want this to run overnight.

How do I get my Flex Monthly schedule to run?