MFA SMS delivery issues
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Jernej Admin
0
Reputation points
Hello,
we are using MS entra ID to authenticate users in our application. Some accounts use SMS and some MS Authenticator for MFA.
MFA with SMS token fails because user does not get the SMS message. When we check sign-in Logs in entra portal we see "Multi-factor authentication method is blocked." as failure reason.
In the past we had issue like this because MS blocked SMS delivery to our country (Slovenia, phone numbers starting with +386). MS support then re-enabled SMS delivery for out tenant.
Can you please check if there is the same issue again.
Thank you and best regards.
Jernej
Microsoft Security | Microsoft Entra | Microsoft Entra ID
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VEMULA SRISAI 2,040 Reputation points Microsoft External Staff Moderator2025-11-11T09:30:20.2433333+00:00 Hello Jernej Admin ,
I understand you’re experiencing issues with MFA where SMS codes are not delivered, and the sign-in logs show “Multi-factor authentication method is blocked”. This typically occurs when the phone number or route is flagged with bad reputation (error detail: BadReputation).
could please send the following details via private message so we can assist further:
- Email address
- Phone number (mask last few digits)
- Tenant ID
- Country and country code
Please share the details for further assistance.
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