You will not receive a Form 8606 from anyone. It is created in your tax return when you indicate that you have make a non-deductible Traditional IRA contribution. This means that when you create your amended return to report the non-deductible contribution, the Form 8606 will be created and filed with the amended return.
Converting the Traditional IRA to a Roth IRA has no impact on your 2023 amended tax return. The timing of the conversion does not matter. Since it is going to be done in the 2024 calendar year, you will receive a 2024 Form 1099-R reporting the distribution from the Traditional IRA which you will enter into your 2024 tax return showing that it was converted to a Roth IRA. Having the Form 8606 from your 2023 amended return will make the conversion a non-taxable event.
Take a look at the following TurboTax help article for more information about reporting a back door Roth IRA conversion. Pay close attention to the part reporting the non-deductible IRA contribution because that is what you will need to do with your amended 2023 return. The other part will be done on your 2024 return after you get the Form 1099-R.
How do I enter a backdoor Roth IRA conversion?
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