Usually a partner discount says "up to $20" which depends on the product edition. So Premier through Fidelity may be a $15 discount. Yes, it should be in addition to the early season discount.
When working on your return, have you been accessing TurboTax through the special discount portal linked from the Fidelity website? That's how it knows to apply the discount.
Check your fees this way:
Log in through the Fidelity discount portal link, open your return, and in the left menu column, click on TAX TOOLS, then TOOLS. In the Tools window, choose MY FEES.
What is displayed there?
