Microsoft Security | Microsoft Entra | Microsoft Entra ID
A cloud-based identity and access management service for securing user authentication and resource access
Error code 399287 when requesting SMS for MFA
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(230.39999999999998, 77%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EEB%3C/text%3E%3C/svg%3E)
Elena Burnham
0
Reputation points
We're getting the following error when requesting an OTP code via SMS text message:
Error Code: 399287
Request Id: 5a678763-a581-4813-ac6c-12ef65c10500
Correlation Id: 93a36e8f-1f4e-4a2e-92e8-2dd8b41addff
Timestamp: 2026-07-01T09:58:24Z
Please remove the phone number (+XXX XXXXXXXX34) from the bad reputation list.
Microsoft Security | Microsoft Entra | Microsoft Entra ID
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