When you were working on filing your return, you had the option to select the prepaid card. If you selected that, Turbo Tax added the information needed for the IRS and/or your state to deposit the funds on the card. You can check your selection by logging back into your return, going to the file tab, and clicking through the prompts to you get the section where it asks how you want to receive your refund.
Here you can check to see what was selected.
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