As Platinum, I was able to start early check-in yesterday April 10, for our April 26 cruise. I was not home, so did it except for passport number and emergency contact, and it had seemed like information was saved for completion later. I logged back in tonight at home, and am blocked. It tells me check-in is available tomorrow, April 12. What gives? Does early check-in have to be done all at once, or you lose it?