SC-300 Certification Practice Question #112

Question

You have a Microsoft 365 tenant.

All users have mobile phones and Windows 10 laptops.

The users frequently work from remote locations that do not have Wi-Fi access or mobile phone connectivity. While working from the remote locations, the users connect their laptop to a wired network that has internet access.

You plan to implement multi-factor authentication (MFA).

Which MFA authentication method can the users use from the remote location?

Accepted Answer

The scenario's constraint is that the laptop has wired internet but the user's phone has no Wi-Fi or cellular connectivity at the remote site. The Microsoft Authenticator OATH verification code (a TOTP generated locally every 30 seconds) is the only listed method that works on a device with no signal — MS Learn explicitly states the app "can generate verification codes even when the device has no signal at all." SMS (B) and voice both require cellular service, and a push notification (D) requires the phone to reach Microsoft over a data connection, neither of which is available. App passwords (C) are for legacy clients that can't do modern MFA and are not an interactive verification method. Suggested Answer, the community vote, and MS Learn all converge on A.

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