Thanks @adrianenriquez. I gave that a try, no luck.
It's the same result that I previously had. The PerkSpot link takes me to a PerkSpot splash screen, which forwards me to a TurboTax page that asks me to choose which product I want. That page says "PerkSpot has teamed up with TurboTax" and it has a PerkSpot logo in the corner.
The pricing options on the different products on this page show the discount, but when I select one and then log in to my account, I find that the discount hasn't actually been applied in my account. I can go to the "review your order" page and it's showing me non-discounted prices.
