You must register your biometric authentication on your device (iPhone) in advance.
Setting up Face ID on an iPhone
Please refer to the descriptions provided either to the right of or below the images for an explanation of each step
1.1. Access the Multi-Factor Authentication (MFA) settings page
Access the Multi-Factor Authentication settings page( https://keio.okta.com/enduser/settings )on your smartphone's browser and log in with your keio.jp account (ID and password).
1.2. Under "Security Method," click "Set up" in the "Security key or biometric authenticator" section.
1.3. Verify with your password
Enter your keio.jp account password and tap "Verify."
1.4. Verify with your phone
To verify via SMS, tap "Receive code via SMS." To verify via voice call, tap "Receive a code via SMS."
1.5. Verify with your phone
Enter the verification code sent to your registered phone number (6 digits for SMS or 5 digits for voice call) and tap "Verify."
1.6. Set up security methods
Tap "Set up."
1.7. Setting up a security key or biometric authenticator
Tap "Set up."
1.8. Create a passkey in iCloud Keychain
Tap "Add Passkey."
You will be prompted for Face ID, Touch ID, or your PIN; once authenticated, "Done" will be displayed.
1.9. MFA settings page in your browser (Security Methods)
Once authentication is successful, the screen will automatically transition, and the authentication factor will be registered.
We recommend setting a nickname so you can easily distinguish between your accounts and devices.
Please Note:
It is possible to register multiple passkeys for the same device or account.
If you delete the most recent passkey, you will no longer be able to log in, even if the setting still appears to be active.
When deleting a passkey, please check the registration date and time of the security methods on the multi-factor authentication (MFA) settings page, and ensure you only delete the older entries.
End of guide