Entering "0" as your AGI will work if you did not file a return in the previous tax year.
If you receive a rejection, the best way to ensure you are entering the correct AGI is to confirm that it is the same number that the IRS has on file. You can order a free (digital) copy of your tax return transcript from the IRS. This document will contain the AGI the IRS has on file for you. Refer to the following TurboTax FAQ to obtain a copy of your transcript: Can I get a copy of my tax return from the IRS? - Community
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