There are two ways to sign in on a new device:

• If your passkeys sync (most common), just sign in normally.
• If your new device doesn’t have a passkey yet, add one from an existing signed-in session.

1. Open WatchThis on the new device.
2. Go to /auth.
3. Click Sign In with Passkey.
4. Approve the prompt on your device (Face ID/Touch ID/Windows Hello/Android lock screen).

If your prompt doesn’t appear, see Passkey Prompts Not Showing.

Use this when the new device doesn’t have your WatchThis passkey available.

1. On a device where you’re already signed in, go to Profile (/profile).
2. Open the Security tab.
3. Under Passkey Devices, click Add Passkey.

You’ll see a claim screen with a link and QR code.

1. On the new device, open the claim link (or scan the QR code).
2. Follow the passkey prompt to create a new passkey for your account.

After registration, the new device appears in your device list on the original device.

• Claim links expire after a short time for security.
• Your account must always have at least one passkey.
• You can keep multiple passkeys (for example: laptop + phone).

• Manage Passkeys
• Create an Account with Passkeys (No Passwords)