Amended return refunds are paid by check and contain no bank info. It would not process in time, and you are not amending anything on the tax return so that's not a solution.

Make sure you are using the correct information for the year you chose on IRS.gov, Direct pay. The 2020 should be the easiest, providing the IRS has processed it. You can try one of the other on-line pay sites that charge a fee but you'll get it paid.