I have been having issues today. I was trying to cancel a resort reservation and finally was able to do it through the app. I tried off and on for about 12 hours. I still have one park reservation I can’t seem to cancel, as the option to cancel doesn’t come up, although I was able to cancel all the others.
It was down for me today at noon, when I was trying to remember if my Remy was at 12:15, or Frozen! But it came back up and has been fine the rest of the time for me. I cancelled some dining reservations, and booked Genie_ with no issues.