It stuck at SMS verification. Errors as below Error Code: 399287

Question

Hi,

I am not able to login to https://admin.microsoft.com with my account. It stuck at SMS verification.

Errors as below

Error Code: 399287

Answer 1

Hi @Natalie Zak,

Welcome to the Microsoft Q&A forum.

Thank you for contacting us. I understand that you are currently not receiving the verification code via SMS with error code 399287. Please allow me to provide the following information:

Error code 399287 occurs when the Microsoft system detects unusual activity on your device and marks your phone number as unsafe. This action is taken to protect your account and tenant information.

In this case, I recommend that you contact the Data Protection team for assistance in resetting MFA for your account. They will also help check your device and mark it as safe (this process will not compromise your personal information).

To contact the Data Protection team, please follow these steps:

• Use the following link to make a call: https://support.microsoft.com/en-us/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2#ID0EBBD=signinorgid

Instructions when calling:

• Reason for the call: AdminCenter
• Role: Global Administrator
• Request Description: Mention the keyword “AdminCenter”
• If asked whether there is another administrator: answer “No” to be transferred to the support team and create a service request.

Note: We appreciate your understanding regarding the scope of support through this forum. Our role is to provide general guidance and assist with common troubleshooting steps. We do not have access to internal systems or administrative tools required to handle account or backend issues, but we will continue to support you within our responsibilities.

After the Data Protection team helps reset MFA and marks your device as safe, I recommend asking them to assist in adding an additional authentication method to prevent this issue from happening again in the future.

I hope this information is helpful. Please follow the steps above and let me know the result. If the issue is not resolved, we will work together to find a solution.

Thank you for your patience and understanding. If you have any questions or need further assistance, please share them in the comments section of this post so I can continue to support you.

I look forward to your feedback.

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