Frame the decision correctly
Two-step verification enables the use of multiple authentication factors during login. Authenticator codes, passkeys, and SMS do not share the same user experience or threat model. Adding one method does not mean other security requirements are automatically met; the interface must clearly indicate which step is required.
What should be considered during implementation?
Simply displaying a QR code during setup is not enough. The user must verify the setup using the generated code and securely store the recovery method. They should not send one-time codes, the QR image, or the recovery key to support chat, as these could grant access to the account.
Verification and next steps
The appropriate security flow may differ for administrators and customers. Returning to the site after strong authentication should not result in an unexpected loss of the session. Device loss, password changes, and logout actions must also be tested; security is not limited to just the successful login screen.
Your quick checklist
- Verify the setup with a code.
- Protect the recovery method.
- Test the session behavior.