Are you using TurboTax CD/Download or TurboTax Online?
Most first-time filers have to mail in their returns. After you get your Notice of Assessment, you'll be able to sign up for MY Account, and NETFILE next year.
This CRA website tells you how to sign up for My Account: https://www.canada.ca/en/revenue-agency/services/e-services/cra-login-services/cra-user-password-hel...
