Which platform supports Microsoft Authenticator passwordless sign-in for two tenants?
Short answer
A Provide iOS devices, because Microsoft Authenticator supports passwordless phone sign-in for multiple Microsoft Entra accounts from a single iOS device.
Question
Key Takeaways
It tests which platform Microsoft Authenticator supports for passwordless phone sign-in with more than one work account on a single device, and the trap is assuming Android behaves identically in exam doctrine.
This MS-102 item asks which device platform lets each user hold accounts from two Microsoft 365 tenants in one Microsoft Authenticator install and use passwordless phone sign-in for both. The answer is iOS (A), the platform the exam scenario keys for multi-account passwordless phone sign-in.
Common mistake: Picking Android because the Microsoft Authenticator app also ships on Android — the single-device, dual-tenant requirement points to the iOS multi-account phone sign-in wording the exam was written against.
Expert Analysis
Why the Answer Is Correct
Microsoft Authenticator's passwordless phone sign-in lets one install hold several work or school accounts — including accounts from two different Microsoft 365 tenants — and approve sign-ins from that phone. When this item was authored, the multi-account form of that capability was documented for iOS, with guidance that "Consultants, students, and others with multiple accounts in Microsoft Entra ID can add each account to Microsoft Authenticator and use passwordless phone sign-in for all of them from the same iOS device." Because the scenario gives each user exactly one device that must serve both tenants, the platform that satisfies the requirement as tested is iOS, making option A the keyed answer. The unanimous community vote for A reflects that same reading of the docs.
Why the Other Options Are Wrong
Android (B) is the real distractor: Microsoft Authenticator does exist on Android and supports passwordless phone sign-in, and one commenter even calls the item obsolete for that reason, but Android's multi-account passwordless support was not the documented answer this scenario was written against. Windows (C) fails because there is no Microsoft Authenticator client for passwordless phone sign-in on Windows — desktop authentication there relies on Windows Hello and platform credentials, not the phone app the question mandates. macOS (D) fails for the same structural reason: Microsoft Authenticator is not offered as a macOS phone sign-in client, so it cannot be the platform "provided" to hold the app and serve two tenants.
Community Comment Notes
belyo adds the most valuable caveat, noting that passwordless sign-in with multiple accounts now works "on any supported Android or iOS device," which is genuine real-world drift but does not retroactively change how the exam item is scored. Motanel and Charlie33 both anchor their answer to the same Learn article on howto-authentication-passwordless-phone, and an unnamed commenter quotes the iOS-specific line about adding "each account to Microsoft Authenticator and use passwordless phone sign-in for all of them from the same iOS device." Taken together, the thread backs A on exam doctrine while openly flagging that production guidance has since broadened.
Exam Strategy
When an MS-102 scenario hinges on a single device serving multiple tenants, first ask which platform the authenticator app actually supports for that multi-account capability, not which platforms merely have the app. Eliminate Windows and macOS immediately, then choose the platform named in the multi-account passwordless phone sign-in documentation. Legacy items like this one key to iOS, so read the wording carefully rather than relying only on today's feature parity.
Official Reference
This link opens the official vendor documentation in a new tab.
Exam Strategy
Narrow the choice to platforms that actually run Microsoft Authenticator for phone sign-in (iOS, Android) and only then apply the multi-account, multi-tenant requirement. Windows and macOS should be eliminated first because they have no Authenticator phone sign-in client. For this legacy item, the multi-account wording points to iOS.
Frequently Asked Questions
Why is iOS the answer when Android also supports passwordless phone sign-in?
Can one Microsoft Authenticator install hold accounts from two Microsoft 365 tenants?
Community Votes
100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 4 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 4
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belyo 👍 7You can enable passwordless phone sign-in for multiple accounts in Microsoft Authenticator on any supported Android or iOS device this Q is obsolete
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Motanel 👍 3 Answered AAnswer correct https://learn.microsoft.com/en-us/entra/identity/authentication/howto-authentication-passwordless-phone
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[Removed] 👍 1You can enable passwordless phone sign-in for multiple accounts in Microsoft Authenticator on any supported iOS device. Consultants, students, and others with multiple accounts in Microsoft Entra ID can add each account to Microsoft Authenticator and use passwordless phone sign-in for all of them from the same iOS device.
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Charlie33 👍 1 Answered Ahttps://learn.microsoft.com/en-us/entra/identity/authentication/howto-authentication-passwordless-phone
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