MS is having trouble verifying my Azure admin account because of error 399287

Question

Hi,

I can't sign in to my Microsoft admin account because of 2FA can't work. I recently recovered my iPhone and when I recover backup of the MS Authenticator app, the work account 2FA got lost. So I have to use the last selection (Text to my mobile phone) to sign in. But it prompts me that it's having trouble verifying my account. Error code is 399287. Please help check on it. Thanks!

Answer 1

Hello Zijian Liu,

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.