Do I need to amend my 2021 Tax Return for converting a 2021 traditional IRA contribution to a backdoor Roth IRA in 2022?

In 2021, I made a $6000 contribution to my traditional IRA account with intent to convert it to a backdoor Roth IRA for the 2021 tax year. However, I was dumb and waited 'til that December to convert my contribution. My broker didn't execute the conversion until January 2022.

 

Fast forward to 2023. I received a 1099-R with code R for 2022. When I entered that info into TurboTax 2022, it said I would have to amend my 2021 tax return. However, I am seeing conflicting info in these forums and all over the internet. Some sources say I do have to amend my 2021 return, while others state I only need to fill out and mail Form 8606 to the IRS.

 

Can someone confirm what the correct path is? If it's to amend my 2021 return, how do I do that in TurboTax 2021? If it's to fill out Form 8606, guidance there would be appreciated.

 

Thanks.