Error code : 399287

Question

Dear Microsoft Support Team,

Kindly need your Assistant to solving my problem :

Issue with Call/Text authentication (Error Code: 399287)

Error Code: 399287

Request Id: e417a495-1604-421a-a230-db4190733200

Correlation Id: cea749fb-c9f5-4972-8573-5249890290c0

Timestamp: 2025-06-04T07:28:25Z
can I send you the same information (tenant id, etc) to remove this "bad reputation" ?
please today is the deadline and im in a hurry to log in , thank you

Answer 1

Hello Saber Ezbiri,

Thank you for reaching out to MS Q&A. I am here to assist you in resolving your issues.

Error code 399287 in Azure AD means that the phone number you’re trying to use for SMS-based MFA has been blocked by Azure’s PhoneReputation service (sometimes reported as “multi-factor authentication method is blocked”) because it was flagged with a poor reputation.

Docs - https://learn.microsoft.com/en-us/answers/questions/2200691/unable-to-verify-identity-for-azure-login-error-39

How to resolve it.

Open an Azure support request

• In the Azure portal, go to Help + support → New support request

• Problem type: “Identity” → “Multifactor Authentication”

• Problem subtype: “MFA method blocked / Phone reputation”

• In the Details section, include:

• Tenant ID
• Phone number
• error code, request id, correlation it and timestamp of the failure • Submit the ticket and escalate to the Engineering (PG) team if possible.

Microsoft staff have repeatedly pointed users’ cases to the PG team in community threads for a backend unblock; SMS MFA will work again once unblocked.

Docs - https://learn.microsoft.com/en-us/answers/questions/2247018/issue-with-sms-authentication-(error-code-399287)

You can also reach out to the IT team or Global Admin to change your authentication method to the Authenticator App.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Siri