Can I un-decline a game and change my response to "accepted" ?
For Schedulers:
When an official declines a game, they will be forever marked "Unavailable" for that game. If you want to reschedule them to that game, you would need to assign them from the "Unavailable" list which is no different from assigning regularly, you're just going to need to view and use the list of "Unavailable" officials instead of the "Available" officials.