That's possible, but the most likely reason is that, while you're eligible for the credit, you probably don't need it.
The Saver's Credit is a "non-refundable" tax credit, which means that all it does is reduce your tax -- it can’t reduce the amount of tax you owe on your return to less than zero, so it won't necessarily make a difference in your refund.
It's calculated on a specific percentage of the contributions you've made during the year, with the percentage based on your adjusted gross income.
Please see the TurboTax article What is the 2021 Saver's Credit? for more information.