You can enable two-step verification to strengthen authentication for guest users.

Two-step verification is an authentication method that requires users to enter not only their e-mail address and password but also a unique verification code for every login. A verification code is valid only for a single login and cannot be used for subsequent logins. This prevents unauthorized logins in the cases when a password is leaked to others. Guest users receive their verification codes with the e-mail address specified for their login.

The method for logging in to kintone depends on your authentication settings.

• If two-step verification is disabled:
  Log in to kintone by entering your e-mail address and password.
• If two-step verification is enabled:
  Log in to kintone by entering your e-mail address, password, and the verification code sent to your e-mail address.

1. Navigate to the "kintone Administration" screen.
   Opening the kintone Administration Screen

2. Click Guest Authentication.

3. Select the Use 2-step verification for guest authentication check box.

4. Click Save.