If you over-contributed to your 401K and received a 2020 1099-R, you need to report the Excess Contribution, depending on the Code in Box 7.
Click this link for info on How to Enter a 1099-R. Pay close attention to the follow-up question after you enter your 1099-R.
Any excess 401k contributions returned before the end of the current tax year should be covered in a 1099-R from the 401k for the current tax year and enter as a 1099-R in Turbo Tax.
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