Did you use the online account during the 2018 filing season in 2019 to file your return? Is it possible you have more than one account?
Use this link to recover other accounts: https://myturbotax.intuit.com/account-recovery
If you used the CD/download product installed on your computer to file your 2018 return, TurboTax does not have a copy of it. The only copy would be on your computer.
