This is not an IRA contribution. A 401(k) isn't even an IRA. Remove from Deductions & Credits anything you entered there regarding this rollover. This rollover is entered into TurboTax only by entering the Form 1099-R and answering the follow-up questions.
If this message is not resulting from an entry under Deductions & Credits but is instead the result of entering Forms W-2, be aware that amounts with code D in box 12 of your W-2s is not permitted to total more than $19,500 if under age 50 in 2020 or $26,000 if age 50 or over in 2020.
