Microsoft Account Errors

How to Fix Microsoft Account Sign-In Loop with a Shared Phone Number

Natalie Taylor Sep 25, 2026 869 views

Question details

Users are experiencing a continuous sign-in redirect loop when attempting to log into Microsoft accounts that share the same associated phone number.

How to Fix Microsoft Account Sign-In Loop with a Shared Phone Number

Product: Microsoft Account
Device & OS: not provided
Scenario: Attempting to authenticate and access a Microsoft account that is linked to a phone number used by another Microsoft account.
Observed behavior: The authentication system repeatedly redirects between the two accounts, creating an endless loop that completely prevents successful sign-in.

Before you start

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Solution 1Recommended

Contact Microsoft Technical Support

Since the sign-in loop prevents access to account settings, you must reach out to Microsoft's official support channels to resolve the identity conflict.

Resolving an account loop usually requires identity verification from an official representative. Microsoft provides chat and phone support for these specific authentication issues.

Visit the Support Page

Navigate to the official Contact Microsoft Support webpage.

Initiate a Help Request

Click on the 'Get help' button, and then select 'Contact Support' at the bottom of the page.

Select the Product Category

Choose 'Microsoft 365 and Office' or 'Other Products' from the product list dropdown.

Connect with an Agent

Request Technical Support and choose your preferred contact method, either by live chat or phone support.

Support Availability: Live chat and phone support availability may vary depending on your region and the time of day.

Solution 2

Seek Help in the Microsoft Authenticator Forum

If your sign-in loop specifically involves the Microsoft Authenticator app, specialized community support may be required.

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Try WPS Office While Resolving Your Account Issues

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1. Download the Installer: Visit the WPS Office website and download the free installation package for your operating system.
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Frequently Asked Questions

Why does having the same phone number on two Microsoft accounts cause a loop?

When two accounts share a phone number used for authentication, the system may struggle to determine which account is attempting to authenticate. This confusion causes the login server to continuously bounce the request between the two profiles.

Can I remove the shared phone number without signing in?

No, removing or updating a security phone number requires you to successfully sign into the account's security dashboard. If you cannot sign in due to the loop, you must rely on Microsoft Support to verify your identity and fix the issue.

Are there alternative ways to bypass the phone number loop?

If you have previously set up alternate verification methods, click 'Sign in another way' or 'I don't have any of these' on the login screen. You may be able to authenticate using an alternate email address or a physical security key.

Login & Account Issues