The link does not tell you to file a tax return, only register the 2019 account using the same User ID you used for the prior year account.
If you are having a problem registering your 2019 account, then contact TurboTax support for assistance.
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
