There is an annoying bug in the game that happened to me many times in the past:
If I have the game open during the daily reset time, I sometimes don't get the daily stuff. It definitely affects the free spinning wheel and the daily key reset - not sure about other things like daily quest.
I complained to the devs a while back- they sent me a few extra rubies. But the bug kept happening every now and then, so now I just make sure to shut down the game right before the reset time, and start it after.