@Coker Oh, really....https://www.irs.gov/individuals/electronic-filing-pin-request
Special Instructions to Validate Your 2021 Electronic Tax Return
If your 2020 tax return has not yet been processed, enter $0 (zero dollars) for your prior year adjusted gross income (AGI).
If you used the Non-Filers tool in 2021 to register for an advance Child Tax Credit payment or third Economic Impact Payment in 2021, enter $1 as your prior year AGI.
