Since Member cash reservations (with the discount) come from the member inventory, they are NOT available until MS is reasonably certain that the room is not needed for a point reservation.
At some times, this might mean 7 months (actually, I would expect it to be 6 months), at others not until 2 months and at other times not at all. In a few cases it could also mean 11 months (HH in mid Jan?)
The first priority is to reserve the rooms using points. Any availability beyond points reservation would be open for a cash reservation.
Good Luck!