MFA Authentication

Question

I'm trying to sign into the Microsoft 365 portal. I can sign in to my Microsoft account, but I'm prompted to verify my identity via SMS. However, I receive the following error message:

“Sorry, we’re having trouble verifying your account. Please try again.”

Error Code: 399287

Request Id: [Moderator note: personal info removed]

Correlation Id: [Moderator note: personal info removed]

Timestamp: [Moderator note: personal info removed]

I have already tried alternative login methods and password reset options but have been unable to complete the identity verification process. I would appreciate your assistance in resolving this issue as soon as possible as it is a business account. It would be great if you could unblock the MFA to the account.

Answer 1

Hi @John Farrugia,

Thank you for taking the time to share your experience. I hope this response reaches you in time and helps bring some clarity.

Error 399287 typically occurs when an account is unable to complete multi‑factor authentication because required verification methods are missing, unavailable, or inaccessible. This situation can arise if security information was not fully configured, if the account has been temporarily restricted for security reasons, or if authentication settings were disrupted due to device changes or authentication method issues. As a result, the sign‑in process is blocked even though the account credentials are valid.

As a member of the community support team, I have limited access and cannot modify MFA settings for user accounts. For security reasons, the appropriate recovery options may differ based on your role in the organization.

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Option 1: Contact your IT admins

If you are either an admin or end-user in your company, please check if there are other IT admins who still have access and share with them the steps outlined in the article Manage user authentication methods for Microsoft Entra multifactor authentication. This will help them assist you in resetting your MFA settings and restoring access to the account.

In case you do not know who is your IT admin, kindly refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support .

Once the admin completes this process, your previous sign-in sessions will be cleared, and the next time you log in, you will be prompted to set up MFA again from scratch.

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Option 2: Contact Microsoft Data Protection Support by phone

If you are the sole global administrator and cannot access your account, you will need assistance from Microsoft’s Data Protection team. They will verify domain ownership and other required information in order to restore your access.

To reach the team, you can start by calling your regional Microsoft support hotline here: Customer service phone numbers - Microsoft Support.

Please note that forum moderators do not have access to user account settings and cannot assist with logging in, resetting passwords, or changing access rights. While we do not have access to internal systems or administrative tools required to resolve account-specific or backend-related issues but we’ll continue doing our best to support you within the scope of our responsibilities.

During the phone call, you will need to provide the information associated with your subscription, such as your company name, billing details, phone number, and an alternate email address, etc. This information allows the Data Protection team to verify your identity and securely assist you in regaining access to your administrator account.

In some regions, the initial interaction may be automated, so here’s a general idea of how the conversation might go to help you prepare:

(When you call the support number, you may hear an introduction of about 30 seconds such as "you can visit the link...". You can ignore this introduction and wait until you are presented with the options. Then press "1" as a business email user, and again "1" for technical help.)

In some countries, it is an automated conversation like:

IVR: What kind of problem are you concerned about?

You: Authenticator.

IVR: What kind of product do you use?

You: Office 365 for business.

IVR confirmation: education or company account?

You: For companies

IVR: Are you an administrator?

You: Yes.

IVR: Do you have another administrator in your organization?

You: No.

IVR: Do you need a... Service request?

You: Yes. I need to create a ticket. Please send me directly to the Data Protection Team.

I hope this helps you regain access to your account quickly. I'm glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.

If you find my post useful, kindly consider upvoting it. Doing so can assist others in the community who may have similar questions in finding solutions more quickly.

Thank you for your kindness and contributions to the forum.

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