How To Log In From Second Device If Device-Bound Passkey Is Created?

If you created a device-bound passkey, logging in from a second device depends on your setup. You can use a passkey manager that syncs across devices, cross-device authentication with QR code and Bluetooth, or need to use a fallback method.

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Logging in from a second device with a device-bound passkey requires careful setup. Here are the main methods available:

1. Sync with a password manager: Some password managers like 1Password, Dashlane, or Google Password Manager sync passkeys across devices. If you’re using one of these services, the passkey created on one device can be accessed from another. This is the easiest method for logging in from multiple devices without any additional setup.

2. Cross-device authentication: If you don't use a password manager, but have a passkey on a mobile device (like an Android or iPhone), you can log in to a second device via QR code scanning and Bluetooth. This method, known as hybrid authentication, transfers the passkey securely to the second device. After this, you can create a local passkey on the second device for future use.

3. Fallback methods: In some cases, if syncing or cross-device authentication is not an option, fallback methods like OTP (One-Time Passcodes) or traditional passwords might be required. This is especially true for platforms that have existing users and transition to passkeys. However, once logged in using these fallback methods, you may be able to create a passkey on the new device.

Here’s how cross-device authentication works when logging in from a second device:

• When you attempt to log in, the system will prompt you to scan a QR code from your mobile device.
• Your phone and the second device use Bluetooth to assure proximity and build a tunnel over the Internet.
• Once verified, you can log in and then create a new local passkey on the second device for future logins.

This method leverages a secure exchange between devices and ensures that you can access your account without needing to fall back on traditional passwords.

Many password managers have started to integrate passkey support. Here’s what you need to know about syncing:

• Google Chrome: If you use Google Password Manager, passkeys you create are automatically synced across devices, provided you're signed into the same Google account.
• Third-party password managers: Platforms like 1Password and Dashlane now offer passkey syncing across devices. As long as you’re logged into your manager on the second device, your passkeys will be available for login.

If neither of the above methods works, you'll need to use fallback options like:

• Traditional passwords: If the platform still allows password logins, you can use your password to log in and create a new passkey afterward.
• One-time passwords (OTP): Some services offer OTP (usually sent via email or SMS) as a fallback to passkeys. Once logged in, you can then generate a passkey on the second device.

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