@williams-bryan
First of all, your Federal refund must be large enough to cover the TurboTax fees plus the additional service charge for that option, which is $40 ($45 for California filers.) You will avoid that service fee if you pay the TurboTax fees upfront with credit or debit card.
Here are some other reasons why you may not be offered the pay-out-of-refund option:
https://ttlc.intuit.com/community/charges-and-fees/help/why-can-t-i-deduct-my-turbotax-fees-from-my-...
