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Did you follow the quick start instructions to set up the Authenticator first?
Initial State
By default, unauthenticated users are redirected to the Sign In flow. You can explicitly redirect to Sign Up or Reset Password:
Login Mechanisms
Sign Up Attributes
Zero Configuration
The Authenticator automatically infers signUpAttributes from amplify pull,
but can be explicitly defined as seen below.
The Authenticator automatically renders most Cognito User Pools attributes,
with the exception of address, gender, locale, picture, updated_at, and zoneinfo. Because these are often app-specific, they can be customized via Sign Up fields.
By default, the Authenticator will still require any attributes required for
verification, such as email, even if signUpAttributes is empty: