Multi-Factor Authentication (MFA)

Please register your MFA information during working hours (weekdays 9:00 AM to 5:00 PM) whenever possible, so you can quickly receive support from the Information Infrastructure Initiative if any issues occur.

Since MFA is a security measure that protects your account, it cannot be disabled once it is enabled. Please fully understand the following contents before enabling MFA.

Please register multiple MFA information in case you forget your registered mobile device at home, or in case of breakage or loss. We recommend setting up the authentication app on both your mobile device and your PC’s browser to ensure reliable access.

The authenticator app verifies your identity by confirming that you possess the device on which the app is registered. Since the information stored in the app is unique to each device, please note the following:

• If you replace your device or uninstall the authenticator app, you may be unable to sign in.
• Before deleting or resetting the authenticator app, be sure to register an additional MFA information as a backup.

If you install the authenticator app on a new device and stop using the old one, or if your phone number changes, be sure to update your MFA information. Outdated information may cause sign-in verification to be sent to the wrong device or phone number, which can pose a security risk.

Please be careful when deleting an account from your authentication app, as you may not be able to sign in.

Please refer to How to Update MFA Information and Settings for the procedure.