You use the AGI from line 7 on your original form 1040...the one before the amended tax return was prepared.
@SteamTrain is correct. To verify your identity, you will be prompted to enter your date of birth and your adjusted gross income (AGI) from your originally filed 2018 federal income tax return, if applicable. Don't use your AGI from an amended return (Form 1040-X) or a math error correction made by the IRS. AGI is the amount shown on your 2018 Form 1040, line 7.
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