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Authenticator SMS problem

Kocsis Gábor 20 Reputation points
2025-09-24T13:16:00.32+00:00

@Anonymous

Dear Support,

We have a same problem.

Mobile phone has broken so I can not to use Authenticator app.

I try to use "send code by SMS" but not working:

Error Code: 399287

Request Id: f12952f5-c064-43dc-b74c-fc0a63c30a00

Correlation Id: 6f9a968f-4f90-468f-a1e9-570b3aaeaedb

Timestamp: 2025-09-24T13:13:45Z

Please help me unblock this phone number.

Thanks

Gabor

Microsoft Security | Microsoft Entra | Microsoft Entra ID

Answer accepted by question author

Raja Pothuraju 47,640 Reputation points Microsoft Employee Moderator
2025-09-24T14:37:42.1166667+00:00

Hello Kocsis Gábor,

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.

I hope this information is helpful. Please feel free to reach out if you have any further questions.

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