MFA Security Issues

How to Check Microsoft Authenticator Phone Number History and Secure Your Account

Maira Mehtab Sep 20, 2026 869 views

Question details

The user wants to retrieve a historical log of phone numbers added to or removed from their Microsoft Authenticator app between 2023 and 2024, including details on who added them and from where.

Product: Microsoft Authenticator
Device & OS: not provided
Scenario: Discovering unfamiliar phone numbers linked to an account and investigating potential unauthorized access or fraudulent activity.
Observed behavior: Microsoft Authenticator does not display a historical log of added or removed phone numbers, leaving the user unable to track account modifications natively within the app.

Before you start

Before proceeding, take immediate screenshots of any unfamiliar numbers or settings in your Authenticator app to preserve evidence of potential unauthorized access.

Solution 1Recommended

Review Account Security and Recent Sign-in Activity

Since Authenticator lacks a dedicated phone number history log, you must check your overall Microsoft account activity to spot unauthorized access and secure your account.

Microsoft Authenticator does not maintain a historical log of deleted verification methods. To understand how unauthorized numbers were added, you need to investigate your Microsoft account's central security dashboard.

Access your Microsoft Account Security page

Navigate to the official Microsoft account website in your browser, log in with your credentials, and click on the 'Security' tab from the main navigation menu.

Check recent sign-in activity

Click on 'Sign-in activity' to view a list of recent logins. Look for unfamiliar locations, devices, or IP addresses that might indicate someone else accessed your account.

Remove unknown verification methods

Go to 'Advanced security options' and carefully review all listed phone numbers and email addresses. Click 'Remove' next to any contact method you do not recognize.

Change your password and enable MFA

Immediately update your account password to a strong, unique combination. Ensure that Multi-Factor Authentication (MFA) is turned on to prevent future unauthorized access.

Keep Records: Always take screenshots of unfamiliar activity or unknown phone numbers before removing them, as this information may be required if you need to report fraud.

Solution 2

Contact Microsoft Support for Fraud Investigation

If you suspect your account has been compromised, official support can help investigate unauthorized changes that are not visible to users.

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Frequently Asked Questions

Can I export a log of changes made in Microsoft Authenticator?

No, Microsoft Authenticator does not currently offer a feature to export or view a historical log of added or removed verification methods. You must rely on the central Microsoft account security dashboard for activity logs.

What should I do if I find unknown numbers in my authenticator app?

Take a screenshot for your records, immediately remove the unfamiliar numbers from your account settings, change your Microsoft account password, and review your recent sign-in activity for unauthorized access.

How can I check where someone signed into my Microsoft account?

You can view your sign-in history by logging into your Microsoft account online, navigating to the Security section, and selecting 'Sign-in activity'. This page displays the locations, devices, and IP addresses of recent logins.

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