The latter: Only the KVS Tool supports Dynamically-Priced FB Awards (CR/CV/YR/YV), as well as the Extended FB Availability for its own members (as described above).
Thanks
Please see above and also consult the AF/KL/KQ/A5 sections of the KVS Tool User Guide for a detailed listing of these Booking Classes.
The user guide does not explain why KVS is showing upgrade availability whereas the airline's own system is not.