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Log in problem

Mark Abney 0 Reputation points
2026-04-28T00:54:30.5033333+00:00

Why cant i log into my account using sms on my phone?

Outlook | Web | Outlook.com | Account management, security, and privacy

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  1. Manoel Barros 19,455 Reputation points Independent Advisor
    2026-04-28T01:57:57.4466667+00:00

    Hi!

    Are you not receiving the code via SMS? Or are you entering the code but Outlook isn't working? Please provide more details about the problem you're having.

    • Also, try testing with a different browser and using a different device.

    Use the guide below if you are not receiving the verification code by phone.

    https://support.microsoft.com/en-us/account-billing/troubleshoot-microsoft-verification-code-issues-409090c4-92b5-42b9-8ae6-bcc97e62fc48

    • You should also use the Sign-In Helper in Can't sign in?.

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  2. AI answer

    2026-04-28T00:54:41.87+00:00

    Several common issues can prevent signing in with SMS on a phone:

    1. Temporary block or “bad reputation” on the phone number
      Microsoft may block sending verification texts if there is unusual or excessive activity, or if the phone number/region is flagged as risky. In this case, codes may not be sent at all and errors like “We cannot send a text message to this number” or similar can appear. These blocks usually clear automatically after some time; avoid repeatedly requesting new codes.
    2. VOIP or unsupported number
      VOIP numbers cannot be used for verification codes. A mobile number that can receive standard SMS from Microsoft must be used.
    3. Region or carrier limitations
      In some regions Microsoft’s SMS services have limited functionality or are temporarily unavailable, or the carrier cannot deliver the SMS. If available on the page, try a different method such as Call me or email verification.
    4. Phone or messaging app issues
      • Phone blocking texts from unknown numbers.
      • SMS inbox full or messaging app malfunctioning.
        Clearing storage, checking spam/blocked senders, and ensuring the device can receive SMS from international/US-based numbers can help.
    5. Incorrect or outdated security info
      If the stored phone number is wrong or no longer accessible, SMS sign-in/verification will fail. Security info must be updated (phone number and country code) before SMS can be used reliably.
    6. Multi-factor authentication (MFA) configuration problems
      If SMS is the only MFA method and it stops working (for example due to a reputation block on the number), access may be blocked until support resets MFA or another verification method is added.

    If SMS has stopped working entirely and no other verification option is available to sign in, support from Microsoft (for example via the Microsoft 365 Data Protection team in business/tenant scenarios) is required to reset MFA or clear the phone-number block.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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