Originally Posted by
teammelli8080
When I received the miles, they were actually the old fare class miles!
Welcome to FT.
It depends on which fare class you actually bought-up into. If you're a Platinum Elite there is a chance you bought-up into an M fare which doesn't earn "extra" miles.
You might have also been confused by another promo they run when you check-in to buy extra miles for your trip, which is not bundled-in to the buy-up to F offer.