> ## Documentation Index
> Fetch the complete documentation index at: https://docs-staging-docs-event-stream-action-templates.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Review limitations applicable to Auth0 passwordless connections, including delivery channel quotas and compatible application types per method.

# Passwordless Connection Limitations

The type of authentication you want to use depends on which version of <Tooltip tip="Universal Login: Your application redirects to Universal Login, hosted on Auth0's Authorization Server, to verify a user's identity." cta="View Glossary" href="/docs/glossary?term=Universal+Login">Universal Login</Tooltip> you configured with your application. If you are using the Universal Login experience, you can set up [passwordless authentication using WebAuthN with Device Biometrics](/docs/authenticate/login/auth0-universal-login/passwordless-login/webauthn-device-biometrics) or use <Tooltip tip="Universal Login: Your application redirects to Universal Login, hosted on Auth0's Authorization Server, to verify a user's identity." cta="View Glossary" href="/docs/glossary?term=passwordless">passwordless</Tooltip> connections as described below.

You can set up email or SMS passwordless authentication using the following methods:

1. Universal Login + passwordless connection parameters
2. Classic Login + Lock
3. Classic Login + custom UI + Auth0.js

To learn more about these implementations, read [Configure Email or SMS for Passwordless Authentication](/docs/authenticate/login/auth0-universal-login/passwordless-login/email-or-sms).

### Errors

If you are using an embedded login, we recommend using <Tooltip tip="Custom Domain: Third-party domain with a specialized, or vanity, name." cta="View Glossary" href="/docs/glossary?term=custom+domains">custom domains</Tooltip>. To learn more, read [Custom Domains](/docs/customize/custom-domains).

## Considerations

* You cannot create passwordless users from the <Tooltip tip="Auth0 Dashboard: Auth0's main product to configure your services." cta="View Glossary" href="/docs/glossary?term=Auth0+Dashboard">Auth0 Dashboard</Tooltip>. Create them directly from the [Management API](https://auth0.com/docs/api/management/v2#!/Users/post_users).
* <Tooltip tip="Refresh Token: Token used to obtain a renewed Access Token without forcing users to log in again." cta="View Glossary" href="/docs/glossary?term=Refresh+tokens">Refresh tokens</Tooltip> cannot be retrieved when using a passwordless magic link via email, only an OTP.

## Learn more

* [Passwordless Authentication](/docs/authenticate/passwordless)