You said above that your 2017 return was "never sent out". If that is the case then you have to use "zero" for your 2017 AGI in order to e-file 2018, since no 2017 AGI is in the system for you. If zero does not work then you need to print sign and mail your 2018 return.
Something must have gone wrong with your 2017 e-file. Either you did not actually go all the way through to the orange button that said "Transmit Return Now" and complete the process, or your tax return was rejected and you did not notice or follow up. At this point, you have to print, sign and mail it.
Online preparation and e-filing for 2017 is permanently closed. You have to download 2017 software to a full PC or Mac (not to a mobile device) and then print, sign and mail your return. If you already paid for your TurboTax software, you can contact customer support to push a download of the software to you.
To call TurboTax customer support
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
They are available from 5 a.m. to 5 p.m. Pacific time.
To finish a prior year return started in TT online:https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turb
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS and/or your state received the return.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
