Originally Posted by
ralfp
The button appears before you can check in; it appears at the 24 hour mark. If you click it at that time you will get an error about no ticket existing (or something like that). You have to wait until 1 minute after the button first appears.
My experience has been that the button appears about 1-2 minutes after the 24 hour mark - and then I have always been able to check in. Although I have experienced "out of sync" crash if a check in upgrade occurred and have had to call co.com help to fix.