Who did you get an email from? You wouldn't have received an email about 2018 at this late date. Maybe it is for 2019? If you have another account you would get an email about not filing 2019 in the other account.
It'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/
Or was it a reject email for 2019 because the 2018 AGI was wrong?
