Cannot login using SMS as MFA

Question

Cannot login using SMS as MFA

Filip Machala 45

Hello support,

I have an issue logging in to my work account. I have account work account but when I try to login I cannot use MFA using SMS as I am getting error 399287 when trying to send the message. I don't have other MFA method configured so I cannot access setting to change that. Can you please remove my number from block list?

Error Code: 399287

Request Id: 7a836de2-31c1-4004-b090-c6c280cf0100

Correlation Id: 9ec31799-7003-451d-b107-9af0b24cdf6c

Timestamp: 2026-01-13T10:00:11Z

Best Regards

Filip Machala

Rukmini 42,850 Reputation points Microsoft External Staff Moderator

2026-01-13T10:02:03.9166667+00:00

Hello Filip Machala

Welcome to Microsoft Q&A Platform.

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 email address, phone number, tenant id, country and country code via private message so we can further assist?

Thanks

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Rukmini 42,850 Reputation points Microsoft External Staff Moderator

2026-01-13T10:02:03.9166667+00:00

Hello Filip Machala

Welcome to Microsoft Q&A Platform.

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 email address, phone number, tenant id, country and country code via private message so we can further assist?

Thanks

Answer 1

Rukmini 42,850 Microsoft External Staff Moderator

Hello Filip Machala,

Thank you for sharing your details(user's email address, tenant id, phone number, country code and country) with us over Private Message

I have reached out to the engineering team to unblock MFA for your account. They have now unblocked it from the backend and removed the bad reputation on it. You should be able to log in to the Azure Portal without any issues.

Please try logging in and check if you can complete SMS authentication without any errors. Let me know if you encounter any issues.

I hope this information is helpful. Please feel free to reach out if you have any further questions.

If the resolution was helpful, kindly take a moment to click on and click on Yes for was this answer helpful. And, if you have any further query do let us know.

Rukmini 42,850 Reputation points Microsoft External Staff Moderator

2026-01-14T09:21:09.35+00:00

Hello Filip Machala, If the resolution was helpful, kindly take a moment to click on and click on Yes for was this answer helpful. And, if you have any further query do let us know.

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Cannot login using SMS as MFA

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