[Important] Notice
To enhance security, multi-factor authentication (MFA) will be mandatory for all students, faculty, and staff at keio.jp starting June 1, 2026. As a result, we are reviewing the routine use of "Phone (SMS/Voice Call)," which may be deprecated or discontinued in the future.
The use of phone-based authentication (SMS/Voice Call) carries risks such as interception of verification codes or unauthorized call forwarding. In recent years, a transition to more secure authentication methods has been highly recommended. Okta, the provider of the keio.jp authentication infrastructure, also deprecates phone factors (SMS/Voice Call) and recommends the use of passkeys and other secure methods. If you are currently using "Phone (SMS/Voice Call)" as your primary MFA method, please register an additional "Passkey (Biometric Authentication)" or "Okta Verify" as soon as possible and migrate your login procedure.
As of May 2026, "Phone (SMS/Voice Call)" remains available as a backup for situations such as device replacement or hardware failure.
What Is SMS Authentication and Is It Secure?
https://www.okta.com/blog/identity-security/sms-authentication/
IInitial Setup Guide (Phone)
Setup: Smartphone
Setup: PC & Smartphone
Features :
You will receive a 5 or 6-digit one-time code via SMS or voice call, valid for a limited time only. Enter this code to complete authentication. （Reference:：How to Log In）
The phone number registered here will also be used for "Additional Setup."
Notes :
Please ensure that spam filters or "Silence Unknown Callers" features are disabled.
For users without a phone number :
Please refer to "Additional Setup" and register at least two authentication factors as a backup.
Planning to go abroad :
Please refer to "Additional Setup" and register two or more authentication factors. We highly recommend using "Biometric Authentication" as your primary method. For smartphone users, we recommend setting up "Biometric Authentication" and installing the "Okta Verify App" as well.
If you have completed phone registration :
Please proceed to "Additional Setup."
Setup: Smartphone
Setup: Smartphone
If you have completed phone registration :
Please proceed to "Additional Setup."
Please refer to the following pages for frequently asked questions regarding Multi-Factor Authentication .
・Multi-Factor Authentication – FAQ
Before contacting us regarding keio.jp MFA, please try our chatbot （Keio.jp authentication is required for access. ）。
・keio.jp MFA Dedicated Chatbot
If the FAQ or chatbot does not resolve your issue, please contact us using the form below.