> ## Documentation Index
> Fetch the complete documentation index at: https://docs.corbado.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Passkey Creation: On 2nd Device

> This flow explains how users append a passkey when logging into a device that cannot access their existing passkeys. Passkey Intelligence declines passkey login and the user creates a new passkey on this device.

## Passkey Creation on Device Without Access to Existing Passkeys

Users logging into a device where their existing passkeys are not accessible (e.g., logging into a mobile phone but only having a Windows Hello passkey which is device-bound and cannot be used on mobile phones or different Windows computers) follow this flow. **[Passkey Intelligence](/corbado-connect/features/passkey-intelligence)** recognizes the user has passkeys but they can't be accessed on this device, so it declines passkey login and allows the user to append a new passkey on the current device.

<Tabs>
  <Tab title="macOS" />

  <Tab title="Windows" />

  <Tab title="iOS" />

  <Tab title="Android" />
</Tabs>

<Steps>
  <Step title="User enters identifier">
    * User enters their identifier (email/username) on the login page.
    * System now knows which user account is attempting to log in.
  </Step>

  <Step title="Passkey Intelligence analyzes and declines passkey login">
    * [Passkey Intelligence](/corbado-connect/features/passkey-intelligence) analyzes the user's passkey availability.
    * It detects the user has at least one passkey registered on their account.
    * However, those existing passkeys are NOT accessible on this device (e.g., user has a Windows Hello passkey which is device-bound and cannot be used on this mobile phone).
    * Passkey Intelligence declines to initiate passkey login because it would fail.
  </Step>

  <Step title="Fallback to traditional login method">
    * System falls back to traditional login method (username + password).
    * User successfully logs in using their password.
  </Step>

  <Step title="Passkey append initiates on current device">
    * After successful login, the system offers to create a passkey on this device.
    * This allows the user to have a passkey accessible on this device for future logins.
  </Step>

  <Step title="OS-native biometric modal appears">
    * The user chooses a biometric method or PIN to set up the passkey.
  </Step>

  <Step title="Passkey creation successful">
    * User successfully creates a new passkey on the current device.
    * The user now has passkeys on multiple devices.
  </Step>

  <Step title="Redirection to app dashboard">
    * User is redirected to the app dashboard.
  </Step>
</Steps>