Can multiple users of the same smartphone share the Microsoft authenticator app

Question

Can multiple users of the same smartphone share the Microsoft authenticator app.

We have an issue that relates to multiple users of the same work smartphone, i need to know if MFA works with multiple users of the same workphone

Answer 1

Dear @MARKS, Damien,

Good day! Welcome to Microsoft Q&A forum!

Based on your description, I understand that you’re trying to determine whether multiple users can share the Microsoft Authenticator app on the same work smartphone, and whether MFA will function correctly in an environment where several users access a single device.

Regarding this situation, it is technically possible for multiple users to use the Microsoft Authenticator app on the same smartphone. The app allows multiple accounts to be added, so each user can register their own MFA method within the same app.

However, there are a few important considerations to keep in mind:

• User experience: With multiple accounts in the app, authentication prompts (push notifications or codes) may be harder to distinguish between users
• Security considerations: Since all accounts are stored on the same device, there’s a higher risk if the device is lost, shared without proper controls, or accessed by the wrong person
• Management & Maintenance: Removing access (e.g., when someone leaves the organization) requires ensuring their account is properly removed from the shared device

If you plan to proceed with a shared device setup, you may want to consider:

• Ensuring users clearly identify their accounts within the app (e.g., naming conventions)
• Implementing device access controls such as PINs or biometric locks
• Regularly reviewing and removing unused or inactive accounts

Additionally, depending on your organization’s requirements, you may also consider alternative MFA methods such as SMS, voice calls, or hardware tokens.

Since MFA is a key part of your organization’s security posture, I would recommend discussing your setup and requirements with your IT administrator or security team. They can help ensure the configuration aligns with your organization’s policies and may suggest options like device management or alternative authentication methods.

I hope this helps clarify your situation.

Kindly let me know when there are updates or if you need further assistance. Any updates you’re able to share would be really helpful.

I'm here and happy to help! Thank you for your kindness and patience!

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Answer 2

Yes, multiple users can use Microsoft Authenticator on the same physical smartphone, but it must be done in a secure, managed way rather than simply sharing a single personal Authenticator instance.

For work scenarios with shared devices (for example, frontline workers sharing a work phone), Microsoft provides Shared device mode for Android:

• The device is configured as a shared device by IT (typically via an MDM such as Microsoft Intune).
• The MDM pushes the Microsoft Authenticator app and turns on Shared Mode via managed configuration.
• In this mode:
  • A user signs in once and gets SSO to all apps that support shared device mode.
  • When the user signs out, they are signed out of the device and all supported apps, making it ready for the next user.
  • Apps must be written as single-account apps to participate in shared device mode.

This approach allows multiple users to securely share the same work smartphone and still use Microsoft Authenticator for MFA/passwordless sign-in, without mixing identities or leaving previous users signed in.

On unmanaged or personal devices, simply sharing the Authenticator app between different people is not recommended, because the app is tied to the device owner’s identity and security context.

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References:

• Shared device mode for Android devices
• Authentication methods in Microsoft Entra ID - Microsoft Authenticator app