Can I e-file if this is my first year filing (the IRS is asking for my AGI from 2018)?

[VolvoGirl]

If you didn't file a 2018 return then enter 0 for the AGI.

[DoninGA]

If you did not file a 2018 tax return then enter a 0 (zero) for the 2018 AGI

If this is also rejected then you will have to print and mail the tax return.

See this TurboTax support FAQ for printing a tax return for mailing - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online...