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Hook or Rule to redirect users who are not recognised



I am brand new here, so apologies if this is an obvious question, but reading through hooks in the auth process hasn’t answered my question.

When I have a user click login I would like to show the Auth0 login challenge, and if the username/email is not found that they are sent to a registration page within my webapp, not use the auth0 registration. Is this a possibility?

I do apprecaite this adds risk as bots can now identify existing and non-existing users but I just want to understand if this is doable and how I might go about it.