If you received the first two payments, the IRS has your information to send you a third payment.
You must fix the rejection to e-file your 2020 tax return. TurboTax would have sent you an email telling you exactly what was wrong. See: How do I fix a rejected return?
The IRS would ask for this to prove some Credit eligibility for children under 17 in 2020.
To reach the IRS, call 1-800-829-1040 Monday through Friday 7 AM - 7 PM.
To reach TurboTax: What is the TurboTax phone number?
For more information, see: How will the third stimulus impact me?
