If you do not have a Google account registered and try to log in, the authentication flow is automatically created and the user is given access. It should allow you to choose between accounts or, if you are not registered, take you to the registration page.
If you do not have a Google account registered and try to log in, the authentication flow is automatically created and the user is given access. It should allow you to choose between accounts or, if you are not registered, take you to the registration page.