My colleague cannot access the One Drive (error 399287)

Question

Dear Microsoft team,

Can you please assist getting this fixed. My colleague cannot continue working.

Thank you,

Katerina

Answer 1

Dear @Katerina Azarova,

I hope you’re having a good day. Thank you for reaching out and for explaining the situation.

Based on the error code 399287, this issue is a sign‑in or authentication failure related to the user’s Microsoft 365 account. This error typically occurs when the account is unable to complete the identity verification step, most commonly due to Multi‑Factor Authentication (MFA) problems or security policies blocking the sign‑in.

If you're using a work or school account, please note that MFA settings are typically managed by your organization's IT administrator. In this case, I recommend contacting your admin to sign in to the Microsoft Entra admin center and reset or require re‑registration of Marina’s MFA methods. After re‑registering MFA (preferably using Microsoft Authenticator), your colleague should try signing in to OneDrive again.

Your administrator can follow the guidance in the following article: Manage authentication methods for Microsoft Entra multi-factor authentication

If you’re unsure who your administrator is, this article may help: How do I find my Microsoft 365 admin?

Please also note that this forum is a user-to-user support space. Forum moderators do not have access to user accounts and are unable to reset passwords, change authentication methods, or intervene in sign-in issues.

I hope this information helps point you in the right direction. If you run into any issues while trying the steps, or if something still doesn’t feel quite right, please don’t hesitate to reach out again. I’ll do my best to support you however I can.  

Looking forward to hearing back from you with any updates or additional details. 

Warm regards, 

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Answer 2

Error 399287 is related to identity verification and multi-factor authentication (MFA) issues when signing in to a Microsoft work account. This type of problem cannot be fixed by configuration changes on the tenant side and requires direct assistance from Microsoft support, specifically the Microsoft 365 Data Protection team.

For a colleague who cannot access OneDrive due to this error, the required action is:

1. Contact Microsoft support so the Data Protection team can verify identity and help resolve the MFA/verification issue on the account.
2. If the affected user is the only administrator and cannot sign in at all, the Data Protection team has dedicated tools and processes to restore access after validating identity.
3. To reach support, use the official Microsoft support channels (phone or support request) for Microsoft 365 for business and clearly state:
   • The user cannot complete identity verification (MFA/SMS) and receives error 399287.
   • The impact: cannot access OneDrive and work resources.
   • That assistance from the Data Protection team is needed to restore access.

If normal sign-in and support entry points are blocked, an administrator can create a temporary Microsoft 365 trial tenant, sign in to the Microsoft 365 Admin Center for that trial, and open a support ticket from there, explicitly explaining that the issue concerns a different existing tenant and requesting escalation to the Data Protection team. After resolution, the trial subscription should be cancelled to avoid charges.

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References:

• Error Code: 399287 - Microsoft Q&A Unable to Verify Identity for Azure Login – Error 399287
• I have a Micrsoft business account and I am the admin and the only user registered under this account. I can't log in because i have replaced my phone and the authenticator doesn't work. - Microsoft Q&A
• I cant log in to my business account because it is requiring Authenticator app which I do not have - Microsoft Q&A