Microsoft Security | Microsoft Entra | Microsoft Entra ID
A cloud-based identity and access management service for securing user authentication and resource access
Phone number: bad reputation (Switzerland)
![](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(246.4, 98%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETM%3C/text%3E%3C/svg%3E)
Tuan Manh Duong
0
Reputation points
This is another phone number from our customer having issue with bad reputation issue:
PII removed
This phone number is from Switzerland, can you help me check it?
Thank you.
Microsoft Security | Microsoft Entra | Microsoft Entra ID
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![](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(220.8, 92%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESM%3C/text%3E%3C/svg%3E)
Sridevi Machavarapu 8,925 Reputation points Microsoft External Staff Moderator2025-12-12T02:52:24.2333333+00:00 Hello Tuan Manh Duong,
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 share below details via private message so we can further assist?
- Tenant ID
- Phone number with country code
- Country
- Email address of affected user
- Correlation ID
- Request ID
- Timestamp
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