"We apologize that we are unable to locate any of your flights available for Check-In at the moment. This may happen if:

1. Your flight does not depart within the next 48 hours; or,
2. You have just purchased your ticket online, in which case, please wait approximately 30 minutes for your latest booking to get activated within our Online Check-In system. Please try again later."

Non of which is the case. When on the members page I have selected my flight and pressed the check in button to which it can't locate the flight.
I have tried as a non member as well.

I also called Cathay to which the lady, could not help me.

Has anybody had this experience? as I have only found examples when people used ba rewards to book cx flights.

Thanks in advance

well what do you know, as soon as I post, I can now check in

In some rare cases, OLCI does not open 48 hours before departure but opens a few hours late. Has happened to me before but not often.

Thanks good to know

I encountered the same situation last week as you did. Received an email notification that OLCI was open, clicked on the link to attempt check-in and encountered the error message as you had quoted.

Waited for a couple of hours later and was able to complete OLCI.

Got a call from Cathay Pacific this morning seems like there was a last minute change of KA aircraft to PVG on Friday A333 to A333 (same J layout…) but apparently I lost my seat. So they offered me 12A. When I did OLCI, it showed I'm at 11A, then I got a call now saying that 12A is occupied but I'm now on 12K…weird.

When a seat is changed through OLCI, the new seat taken becomes "blocked" in the reservation system, but it won't change the seat assignment in the PNR. CX agent, if not using the check-in system, will not see your new seat assignment. The agent then tried to find a new seat for you, and only an available seat can be selected. You therefore ended up with 2 seats under your name, one in check-in system and one in PNR. CX has never solved this problem.

I have had the same issue with aircraft changes, and also where travelling with a minor. The former is fine, IME it usually means they need a bigger plane, which can mean switching from a regional interior to a long-haul one ;-)