Passkey Handoff Testing for Mobile to Laptop Login

When this matters

• A buyer starts signup on Android and uses a laptop passkey prompt to finish account creation.
• An OAuth login redirects through an app, browser, or email link before returning to checkout.
• A SaaS team supports passkeys, magic links, and enterprise SSO in the same funnel.
• A regulated workflow needs clear evidence of where identity state is lost.

How to check it

1. Map each identity option: passkey, OAuth, email link, SSO, password fallback, and recovery.
2. Start the task on mobile and trigger the laptop continuation point.
3. Check redirect targets, selected plan, form state, cart state, and error messages.
4. Record whether the user can recover without restarting the funnel.
5. Write implementation tasks for session storage, redirect allowlists, deep links, and copy clarity.

Common risks

• A passkey prompt appears but the app loses the pre-login task context.
• OAuth state parameters expire or mismatch after device switching.
• Fallback login routes send users to dashboard instead of the intended checkout or form.
• Security copy is accurate but does not tell the user what to do next.