It's been answered above. But again, You need your 2018 AGI to efile 2019. The AGI is on 2018 1040 line 7.
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947
Or see the screen shot by critter on this one,
https://ttlc.intuit.com/community/taxes/discussion/re-i-m-order-to-complete-my-taxes-it-is-asking-me...
That's common to end up with multiple accounts. First LOG OUT of whatever TurboTax account you're logged into right now. Then use this TurboTax account recovery website to get a list of user ID's for an email address. Run the tool against any email addresses you may have used
https://myturbotax.intuit.com/account-recovery/
If you used the Desktop CD/Download program then the only copy is on your computer and not saved or stored online.
