The only place to reliably get last year's AGI is from your originally-filed, unamended 2017 tax return copy or an official IRS transcript.
The IRS requires your AGI for
identity verification.
Please review the following TurboTax
FAQ on locating your previous year's AGI:
https://ttlc.intuit.com/replies/3301618
Please see the TurboTax FAQ below for
more information on your rejected AGI: https://ttlc.intuit.com/replies/5595742
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