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Microsoft Login Blocked with Error 399287: Thailand Phone Number, Microsoft Authenticator Enabled

Tridanai Tonyoopaiboon 0 Reputation points
2026-06-04T08:01:15.2333333+00:00

I am facing a critical issue where I cannot log into the Azure portal due to the error "Sorry, we're having trouble verifying your account. Please try again" (Error Code: 399287). This is severely impacting my ability to manage Azure services and renew my subscription's credit card (which has expired, causing service disruptions). Here are the key details:

  1. Configuration:
    • My account is configured with Microsoft Authenticator.
    • A verified Thailand phone number (country code 66) is registered for MFA, which works for non-Azure services.
  2. Error Details:
    • Despite having both Microsoft Authenticator and the Thailand phone number enabled, Azure blocks all MFA methods during login.
    • Cloud not send SMS to my phone number show with this error.
    <pii memoved>
Microsoft Security | Microsoft Entra | Microsoft Entra ID

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  1. Shubham Sharma 16,640 Reputation points Microsoft External Staff Moderator
    2026-06-04T08:24:21.97+00:00

    Tridanai Tonyoopaiboon

    Thank you for sharing your details via private message.

    I’ve reached out to the engineering team regarding the MFA issue on your account. They have now unblocked it from the backend and cleared the bad reputation associated with it. You should be able to log in to the Azure Portal without any issues.

    Please try signing in and verify if you can complete SMS authentication successfully. Let me know if you encounter any problems.

    As a best practice, I recommend registering the Microsoft Authenticator method for your account instead of relying on SMS. SMS and voice call authentication methods are more vulnerable to IRSF attacks (telephony fraud) and are generally less secure.

    For better practice, I recommend registering with Microsoft Authenticator method to your account instead of SMS method as these SMS/Voice telecom auth methods are susceptible to IRSF attacks telephony fraud.

    If the resolution was helpful, please take a moment to accept the answer and upvote it 👍 to make it helpful to the community.

    Thank you for contacting Microsoft Q&A!

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