I am trying to upgrade a general member for a flight tomorrow using a GPU. I can go to redeem upgrade on my itinerary (same flight) and confirm the upgrade no problem if I choose to do so. However, when I go to do the same on the GMs itinerary it says no upgrade available. The flight has RN1 so I know he should be able to. Am I missing something? Can GMs not take the last available upgradable seat?