Thanks for your answer.
I am confused if I don’t receive the form 8606 this year, how do I report in my 2023 return?
do you mean I have to report both for 2023 and 2024 return if the broker send the form in 2025?
Form 8606 is a form that you need to include with your 2023 tax return by following the steps listed in my previous answer. It is not a form that is mailed to you by the brokerage.
Next year around this time, the brokerage will mail you a Form 1099-R that you will need to include on your 2024 tax return.
So in summary, you will report your non-deductible traditional IRA contribution on your 2023 tax return following the steps here. And then next year on your 2024 tax return, you will report the 1099-R that the brokerage will mail to you which reports the conversion from the traditional IRA to the Roth IRA.