Hi @wspence
Welcome to the Auth0 Community.
I assume if you’re using passwordless with New Universal Login you have configured Identifier First + Biometrics as currently there is no support for Email or SMS passwordless in the New Universal Login https://auth0.com/docs/authenticate/login/auth0-universal-login/new-universal-login-vs-classic-universal-login
If you are using the Biometrics flavour then unfortunately there is currently no way to direct the user to a WebAuthN prompt in the New Universal Login when using a login_hint. This issue is described in more detail here: Passing login_hint to New Universal Login page always prompts password so at present this is only supported with Email/SMS passwordless in Classic.
Warm regards.