MFA & Verification Issues

How to Fix Microsoft Account Verification Code Cannot Be Sent by SMS

Emma Brown Oct 21, 2026 868 views

Question details

Users are unable to receive the mandatory SMS verification code from Microsoft when attempting to sign in or recover their account.

Fix Microsoft Account Verification Code Cannot Be Sent by SMS

Product: Microsoft Account
Device & OS: not provided
Scenario: Attempting to verify identity or recover a locked Microsoft account using a registered mobile phone number.
Observed behavior: The verification code is never received on the mobile device, often due to blocked short codes, carrier restrictions, or system rate limits.

Before you start

Ensure your mobile device has a strong cellular signal, and check with your carrier to confirm that premium SMS and automated short codes are allowed on your mobile plan.

Solution 1Recommended

Unblock Unknown Senders and Short Codes

Check your smartphone's messaging settings to ensure automated verification texts are not being filtered into spam.

Many modern smartphones and cellular carriers automatically block messages from unknown senders or short codes (5 or 6 digit numbers) to prevent spam. Disabling this feature temporarily can allow the Microsoft verification code to come through.

Open Messages Settings

Navigate to the default SMS or Messages app on your mobile device and tap the settings or menu icon.

Check Spam and Blocked Contacts

Look for a section labeled 'Spam Protection', 'Blocked Contacts', or 'Unknown Senders'.

Disable Filters Temporarily

Turn off any active spam filters or unknown sender blocks, then attempt to request the Microsoft verification code again.

Avoid Repeated Requests: Do not request the code multiple times in rapid succession, as Microsoft's security system may temporarily block your number for suspicious activity.

Solution 2

Request the Code Using an Incognito Browser

Using a fresh, cache-free browser session can sometimes resolve backend routing or session errors on the Microsoft login portal.

Solution 3

Complete the Microsoft Account Recovery Form

If SMS delivery completely fails, you must use Microsoft's official recovery form to manually verify your identity.

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Frequently Asked Questions

Why is Microsoft not sending the verification code to my phone?

This usually happens due to carrier restrictions on short codes, automated spam filters on your device, or a temporary security block from Microsoft due to too many rapid code requests.

How long should I wait before requesting another verification code?

If you do not receive a code, wait at least 15 to 30 minutes before trying again. Repeatedly clicking 'resend' can trigger a security cooldown that temporarily locks the SMS feature.

Can I use a VoIP number to receive Microsoft verification codes?

Generally, no. Microsoft's security policies often block Virtual Voice over IP (VoIP) numbers from being used for account verification to prevent abuse. It is recommended to use a standard mobile carrier number.

What happens if I fail the account recovery form?

If your recovery form is rejected, you can try again using more accurate information. You are allowed to submit the form up to two times every 24 hours. Try submitting it from a device and location you frequently used to sign in previously.

Login & Account Issues