Unable to Verify Identity for Azure Login – Error 399287

Question

Unable to Verify Identity for Azure Login – Error 399287

GEPACK, S.A 0

Dear Microsoft Support Team,

I am currently experiencing an issue when trying to access my Azure account. While I am able to successfully sign in to my Microsoft account, I am required to complete an identity verification step when accessing Azure.

However, during the verification process (phone number method), I receive the following error:

“Sorry, we’re having trouble verifying your account. Please try again.”

This issue is completely blocking my access to Azure services.

Additionally, I want to highlight that this tenant does not have any other administrator accounts available. I am the only admin, which makes this situation critical as I currently have no way to access or manage my resources.

From what I’ve been able to gather, this error may be related to a risk-based flag or phone number reputation issue on Microsoft’s side. I would like to clarify that the phone number associated with this verification has never been involved in any illicit activity or abuse, and should not be flagged.

Error Details:

Service: Microsoft Azure

Error Code: 399287

Request Id: <PII REMOVED>

Correlation Id: <PII REMOVED>

Timestamp: 2026-04-07T08:45:32Z

Verification Method Attempted: Phone number

I have already attempted multiple retries and alternative sign-in methods, but the issue persists.

This is a critical access problem, and I urgently need assistance to regain access to my tenant.

Please advise on how this can be resolved or escalated.

Thank you.

Best regards, Francisco Costa

Shubham Sharma 12,765 Reputation points Microsoft External Staff Moderator

2026-04-07T09:20:01.6033333+00:00

Hello GEPACK, S.A

Thank you for reaching out to Microsoft Q&A.

I understand you're experiencing issues logging into your Azure account due to MFA. Based on error code 399287, it appears your multi-factor authentication method is blocked because the phone number has a bad reputation.

Could you please send your requested details via private message so we can further assist?
Shubham Sharma 12,765 Reputation points Microsoft External Staff Moderator

2026-04-07T09:53:08.6933333+00:00

Hello GEPACK, S.A

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.

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Thank you for contacting Microsoft Q&A!