Thank you for your response.
In case anyone is curious, this is the rest of the story: When I talked to the TurboTax advisor, she said that I must have inadvertently indicated on my 2019 return that the contribution was for 2019. So she walked me through the amending process, which just entailed my clicking on "Continue." She told me the correction would be made automatically. Maybe this is accurate and maybe it's not.
