Issues with second stimulus payment

Sorry, we cannot answer the 'why".

The stimulus payment for which you are eligible to receive will be entered on your 2020 federal tax return as a tax credit on Form 1040 Line 30.

The TurboTax program will ask about stimulus payments in the Federal Review section of the program.

For most stimulus questions you need to go irs.gov

I found this on their page:

https://www.irs.gov/coronavirus/get-my-payment-frequently-asked-questions