Please refer to the descriptions provided either to the right of or below the images for an explanation of each step
(When configuring multi-factor authentication on a second or subsequent device, you may skip the operations in this step, as the setup has already been completed.)
1.1. Access keio.jp
Access keio.jp ( https://keio.jp ) using your PC browser and log in with your keio.jp account (ID and password).
1.2. Click "Set up" in the "Phone" section.
(If you replace your computer, biometric authentication data will be lost, which will prevent you from logging in on your new device. To ensure you have a way to recover access on your own, please set up phone authentication if you have a phone available.)
1.3. Set up phone authentication
To register via SMS, select "SMS," choose "Japan" for "Country/Region," enter your phone number, and click "Receive code via SMS." To register via voice call, select "Voice call," choose "Japan" for "Country/Region," enter your phone number, and click "Receive code via voice call." (When "Voice call" is selected, an extension field will be displayed; please leave this field blank.)
[If you do not receive the authentication SMS (Short Message)]
Spam filters or "Unknown Sender Screening" features may be enabled.
Please refer to the manual provided by your carrier and check your settings.
・Docomo（日本語/Japanese）
https://www.docomo.ne.jp/info/spam_mail/sms/
・au （日本語/Japanese）
https://www.au.com/mobile/service/sms/filter/
・Softbank（日本語/Japanese）
https://www.softbank.jp/mobile/support/mail/antispam/mms/
1.4. Set up phone authentication
Enter the verification code (6 digits for SMS, 5 digits for voice call) sent to your registered phone number via SMS or voice message, and click "Verify."
1.5. Proceed to the Set up security methods screen and confirm that the “Continue” button is displayed.
If the “Continue” button appears below the security method setup screen, your phone-based multi-factor authentication setup is complete. Tap “Continue” to log in to keio.jp.
End of guide