---
url: 'https://www.corbado.com/faq/testing-cross-device-authentication-passkeys'
title: 'How do you test cross-device authentication for passkeys?'
description: 'Explore how to test cross-device authentication for passkeys, ensuring seamless user experiences across platforms and devices.'
lang: 'en'
keywords: 'cross-device authentication testing, cross-platform passkeys'
---

# How do you test cross-device authentication for passkeys?

## How Do You Test Cross-Device Authentication Scenarios for Passkeys?

Cross-device authentication is a critical feature of passkeys, ensuring users can
seamlessly authenticate across various devices. Here’s how to effectively test
cross-device authentication scenarios:

### 1. Cover Common Use Cases

- **Mobile to Desktop:** Test scenarios where a passkey created on a mobile device is used
  to log in on a desktop browser.
- **Desktop to Mobile:** Verify authentication using a passkey created on a desktop for
  access on a mobile device.
- **Platform-Specific Flows:** Test transitions between platforms, such as
  [Android](https://www.corbado.com/blog/how-to-enable-passkeys-android) to macOS or [iOS](https://www.corbado.com/blog/webauthn-errors)
  to Windows.

### 2. Simulate Cross-Device Challenges

- **QR Code Authentication:** Ensure QR codes for cross-device authentication are scanned
  and processed correctly.
- **Account Linking:** Verify that accounts can be seamlessly accessed across devices
  without requiring re-registration.

### 3. Test for Compatibility

- **Device Variations:** Include a range of devices in your testing matrix, such as older
  and newer models.
- **Browser Interoperability:** Ensure passkeys work across all major browsers on each
  device type.

### 4. Validate Fallback Mechanisms

- **Unavailable Passkeys:** Test scenarios where a passkey is unavailable on the current
  device and ensure users can fall back to other authentication methods.
- **Alternative Flows:** Verify the smooth execution of fallback options, such as OTPs or
  passwords.

### 5. Address Security Considerations

- **Data Integrity:** Ensure that cross-device authentication protects user credentials
  and does not expose sensitive data.
- **Man-in-the-Middle (MitM) Attacks:** Test for potential
  [vulnerabilities](https://www.corbado.com/glossary/vulnerability) during cross-device communication.

### 6. Usability Testing

- **Clear Instructions:** Check that users are guided effectively through cross-device
  authentication processes.
- **Error Feedback:** Verify that errors are communicated clearly, helping users resolve
  issues quickly.

By rigorously testing these scenarios, you can deliver a robust and seamless cross-device
authentication experience for passkey users.

## Read the full article