Trial and error 😅 . Went for Canada's time zone range but later tried UTC and it worked. So for fixed schedule card people should go for UTC time zone and should be enough. Nonetheless I still can't handle user input back from it. I'm setting a Wait User Input but apparently it doesn't work from this Fixed Schedule tasks, so whenever user reply this message back it goes to straight to "Begin", and sadly, event.preview is not carrying its text.