You can view this Turbo Tax FAQ on verification.
What is my signature ID?
https://ttlc.intuit.com/community/security/help/what-is-my-signature-id/00/27224
Please see this Turbo Tax FAQ on how to find your AGI from last year.
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/00/25947
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