Since there is no RMD required for 2020 then after you enter the 1099R say it was NOT an RMD and then that you rolled it over (even if back into the same account). It will show as income on the Turbo Tax Summary or Review so check the actual 1040. The amount should be on line 4a or 5a and say ROLLOVER by the taxable lines 4b or 5b. See my screen shots on this post,
https://ttlc.intuit.com/community/tax-credits-deductions/discussion/re-rerurned-rmd/01/1798385/highl...
But the withholding taken out will become a taxable distribution if you did not replace it from your own money. So it will say Rollover by line 4b but there will be a taxable amount for the withholding that was distributed (even to the IRS & state). You will still get credit for all the withholding.
