Error logging in to Microsoft Admin Portal, error 399287

Question

I haven't logged into this tenant for a long time (PII.onmicrosoft.com) and now when logging in it presents MFA via Phone or SMS. I have access to the phone number listed, but when clicking either of those methods, I get the error that my account is not validated and no SMS can be sent, no speech call can be placed.

I have access to all login details, phone numbers and alternative e-mail address listed on the account but nothing seems to work. I've opened a case with support (TrackingID#PII) but I don't really seem to be getting anywhere. Hope someone can assist me with unblocking the phone number

Answer 1

Hello De Witjes | Sander

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.

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