New Universal Login: show “Verification email sent” after signup + block login until email verified (no custom pages)

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Hi Auth0 team

I’m building a Web+ mobile app using Auth0 New Universal Login.
I do NOT want to build any custom hosted login/signup pages — I want to stay fully within Auth0 hosted UI.

My signup form collects:

  • Email
  • Password
  • Custom field: Last 4 SSN (or Last4 ID)

I’m validating Last4 + Email using a Pre-User Registration Action by calling my backend.

  • If validation fails, I show an error on the Auth0 signup page (this works fine).
  • If validation succeeds, user is created and Auth0 sends the email verification link.

My requirement:
User must NOT be able to login until they verify their email.
After the user clicks the email verification link, they should be able to login normally.

Current issue / confusion:
After successful signup, Universal Login moves away from the signup form to another screen.
I want the Auth0 UI to clearly show something like:
“We sent a verification email. Please verify before logging in.”

Questions:

  1. Is it possible to show a confirmation message (“Verification email sent”) within Auth0 hosted Universal Login after signup success?
  2. What’s the best Auth0-recommended way to block login until email is verified (especially for mobile apps)?
  3. If I deny login in a Post-Login Action for unverified users, what is the correct UX / error handling approach?

Actions I’m using:

  • Pre-User Registration Action for backend validation
  • Post-Login Action to deny access if email_verified is false

Any guidance / best practice would be appreciated