Retirement tax questions

If you contributed to a 401K through your job, those amounts qualify for the credit, and TurboTax automatically generates Form 8880.   Other savings plan contributions will generate the credit as well.  Full-time students are not eligible to take the credit, so if you indicate that you were a full-time student, you won't qualify for the credit.  @Jackie41

You can go back through the Retirement Savings Contribution Credit questions and edit your answers if you were a full-time student during any 5 months of 2020.   It can be found in the Deductions and Credits section, under Retirement and Investments