Microsoft Account Errors

Fix Microsoft Account Signup Blocked by Phone Security Check Error 40301

Steve K Oct 10, 2026 868 views

Question details

The user is unable to create a Microsoft account due to error 40301, which indicates the phone number failed security checks.

Product: Microsoft Account
Device & OS: not provided
Scenario: Creating a new Microsoft account using a new mobile phone number.
Observed behavior: The signup process is blocked with error code 40301, stating the phone number did not pass security checks, even though the number has never been used before.

Before you start

Double-check that your phone number and country code are entered correctly. Ensure you are not using a VoIP or virtual phone number, as these are frequently blocked by Microsoft's automated security systems.

Solution 1Recommended

Contact Microsoft Support for Manual Verification

Since error 40301 is a server-side security flag, only Microsoft Support can manually verify and unblock the phone number for account creation.

Phone carriers often recycle mobile numbers, meaning your newly purchased number might have been flagged or associated with a Microsoft account by its previous owner. Bypassing this requires manual intervention from Microsoft.

Visit the Microsoft Support Website

Go to the official Microsoft Support page in your web browser and click on 'Contact Us'.

Select Microsoft Account Support

Choose the option related to Microsoft Accounts or Account Signup issues.

Submit a Support Request

Explain that you are receiving Error 40301 and that your phone number is being blocked from signing up.

Use an Alternate Email for Contact

If the support portal asks you to sign in and states your current email is 'already a Microsoft account', use a completely different, active email address just to submit the support ticket.

Contact Microsoft Support for Manual Verification

Wait for Review: Microsoft must manually review the phone number. This verification process may take a few days before you can complete your signup.

Solution 2

Try an Alternative Signup Method

If you need an account immediately and cannot wait for support, using a different signup method can help you bypass the blocked number.

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Frequently Asked Questions

Why does Microsoft flag a brand new phone number with error 40301?

Mobile carriers frequently recycle phone numbers. The previous owner of your new number might have used it for a Microsoft account, or the number may have been flagged for suspicious activity in the past, triggering Microsoft's security filters.

Can I bypass the phone verification step when creating a Microsoft account?

Microsoft often requires phone verification to prevent spam and unauthorized account creation. While you can sometimes initiate signup using just an email address, you may still be prompted to verify a phone number if unusual network activity is detected.

What should I do if Microsoft Support says my email is already in use?

If you receive a message stating that your email address is already associated with a Microsoft account, you must use a different, active email address to contact support or to proceed with a new account signup.

Login & Account Issues