The only other reasons you might not qualify other than insufficient taxable income is if you do not meet the basic requirements or you have made distributions from retirement accounts not rolled over or converted to Roth that reduce the amount of new contributions that are considered when calculating the credit. IF TurboTax permits you to enter the Retirement Savings Contributions Credit section make sure that you have indicated that you were not a full-time student and review any amounts you entered as distributions you received in 2018, 2019 or 2021. (TurboTax automatically fills in the amount for 2020.)
