/en/utokyo_account/mfa/others/の差分更新

src/pages/en/utokyo_account/mfa/others.md

@@ -9,6 +9,26 @@ breadcrumb:
 
 Authentication apps and phone numbers (SMS or phone calls) are the standard verification methods for MFA. However, for faculty members who are unable to register any of the verification methods, such as those who do not have smartphones, we offer a device called “hardware token” as an alternative. Please refer to [UTokyo Portal (only for faculty members)](https://univtokyo.sharepoint.com/sites/utokyoportal/wiki/d/UTokyo_Account_Token.aspx) for details.
 
+## Using UTokyo Account Abroad
+{:#overseas}
+
+When signing in to your UTokyo Account from abroad (e.g., during business trips), service availability depends on your verification method.
+
+- Microsoft Authenticator
+  - You can generally sign in as usual via mobile data or Wi-Fi, provided your smartphone with the Microsoft Authenticator app is connected to the Internet.
+  - On Android, however, signing in via standard push notifications may fail in countries or regions where communication with Google systems is restricted, as notifications rely on Google services. In such cases, you can still sign in using the offline method: [signing in with a 6-digit verification code](#msauth-totp), provided you have your smartphone.
+  - You can still sign in even without an Internet connection by [signing in with a 6-digit verification code](#msauth-totp), as long as you have your smartphone.
+- Other Authenticator Apps
+  - You can sign in using the 6-digit code displayed in the app, provided the code can be generated.
+  - Most authenticator apps work without an Internet connection as long as you have the smartphone with the app installed, depending on the app's specifications. For example, Google Authenticator, which is introduced on the [Initial Setup Procedures for Multi-Factor Authentication (MFA)](/utokyo_account/mfa/initial/) page, functions offline.
+- Phone Number
+  - This method is available only if your mobile plan supports international roaming at your destination, as you must be able to receive Short Message Service (SMS) messages or voice calls at your registered phone number. Please note that international roaming usually incurs charges for receiving incoming calls and SMS messages.
+  - Please make sure to [add another verification method](../change/#add) before leaving the country if your phone service contract does not support international roaming at your destination.
+- Fast Identity Online (FIDO) Security Key
+  - You can sign in as long as you carry your FIDO security key with you.
+
+Before traveling abroad, please check your registered verification methods on the [Multi-Factor Authentication (MFA) Settings Page](https://mysignins.microsoft.com/security-info?domain_hint=univtokyo.onmicrosoft.com) in advance, and [update your registration](../change/) as necessary.
+
 ## Use the 6-digit Code in Microsoft Authenticator to Sign In
 {:#msauth-totp}