Originally Posted by dabears

UPDATE
I spoke to an UA agent at the P1K line today. After explaining her the situation, she verified that there were no irregularities with the way the ticket was booked, everything checked out. Next, she put me on hold to discuss the issue with their team leader. When she returned, she let me know that their team leader was also puzzled but one possibility he thought of was that I was trying to apply for the upgrade too early since the flight is still almost 8 months away. They are not sure about this but they think ANA may have a time limit as to how early one can apply for an upgrade. Not sure I believe this explanation because if this was really the case, I should be getting a different error message, not this nonsense about the cabin selection not matching the reservation. They will also report this issue to ANA and see if they take any action on their end.