Delete the 1099-R you entered and re-enter.
Answer the RMD question that "None of this distribution was a RMD" or "RMD not required" depending on the TurboTax version - because it was NOT a RMD, there were no 2020 RMD's.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**