If you have your 2019 tax return, your AGI is on line 8b of the Form 1040.
If you don't have 2019 available you can try to enter a zero.
You can also request a transcript from the IRS Get an IRS Transcript.
Finally, the last resort is to mail your tax return. TurboTax will print an instruction sheet explaining where to mail the returns.
To mail your Individual Income Tax Return please review the following:
Completing your Return
How do I print and mail my return in TurboTax Onli... (intuit.com)
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