Unable to Verify Identity for Microsoft 365 Login – Error 399287

Question

Dear Microsoft Support Team,

I'm trying to sign into the Microsoft 365 portal. I can´t sign in to my Microsoft account, as im 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: 2025-12-14T08:29:59Z

I have already tried alternative login methods 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 number to the account. Or let me use an alternatie method (Example - other email)

(i am using another email to post this question since i am not able to access my business account)

The bussiness acount i can't access is the admistrador of my account

Thank you for your kind support

Best Regards,

Moved from: Microsoft Security | Microsoft Authenticator

Answer 1

Hello @TimLinda Goodman,

Thank you for posting your question in the Microsoft Q&A Forum. 

Before we proceed, could you confirm whether you are an "end user" or an "administrator" for your organization’s Microsoft tenant? 

1/ If you are an end user 

The quickest and most effective solution is to contact your organization’s IT administrator. They can revoke your current Multi-Factor Authentication (MFA) settings and allow you to re-register.   You can share this official Microsoft article with them for guidance: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |… 

2/ If you are an administrator 

Please check whether there is another admin in your tenant. If there is, they can revoke and require re-registration of MFA for your account by following these steps: 

• Signing in to the Microsoft Entra Admin Center  
• Navigating to Users > Your Account > Authentication methods  
• Selecting Require re-register MFA  
• You will then be prompted to set up MFA again during your next login

3/ If you are the only administrator 

You will need to contact Microsoft’s Data Protection team. This team has the authority and security procedures to verify your identity and reset MFA settings from their end. Please call Microsoft Support using the appropriate hotline for your region: Customer service phone numbers - Microsoft Support 

Here are some tips and an example of a prompt to help you navigate the IVR more effectively:  

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

• What kind of problem are you experiencing?         
• Answer: Authenticator         
• What products do you use?         
• Answer: Office 365 for business         
• Is this for an education or company account?         
• Answer: For companies         
• Are you an administrator?         
• Answer: Yes         
• Are there any other administrators in your organization?         
• Answer: No. I am the only admin in my tenant          
• Do you need a... Service request?          
• Answer: Yes. I need to create a ticket. Please send me direct to the Data Protection Teams.      

Please understand that forum moderators have no control over user accounts, especially when it comes to logging in to your account, resetting your password, changing your access, etc.     

I hope Data Protection team can successfully revoke your access. If you encounter any difficulties with the steps above, please let me know. I’ll review the situation and see if there’s any other way I can assist you.

Best regards,

---

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Answer 2

Hello TimLinda Goodman,

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 answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Thanks

Answer 3

Microsoft-ondersteuning.
Microsoft-ondersteuning.
We hebben onlangs een aanvraag ontvangen om uw Microsoft-account te herstellen. Helaas hebben we vastgesteld dat de door u verstrekte gegevens niet voldoende zijn om uw accounteigendom te valideren. We nemen de beveiliging en privacy van onze klanten zeer ernstig en doen er alles aan om uw persoonlijke gegevens te beschermen.
Hieronder vindt u enkele tips voor het invullen van het formulier:
Ik kan dit account herstellen doordat het nieuw is en ik het ww niet weet. Er staan nog geen verzonden mails in de box waardoor ik geen antwoord kan geven op vragen van het herstel formulier.Hoe los ik dit op?

Beantwoord zoveel mogelijk vragen.

Verzend het formulier vanaf een apparaat dat u vaak gebruikt vanaf een bekende locatie.

Gebruik de gegevens die u hebt opgegeven toen u het account hebt gemaakt of het account voor het laatst hebt bijgewerkt.

Als u Outlook gebruikt, wordt u gevraagd recent gebruikte e-mailadressen en de onderwerpregels uit recente e-mailberichten weer te geven. Vraag om hulp van contactpersonen om hun e-mailadressen te bevestigen en u de onderwerpregels te laten weten van de laatste drie e-mailberichten die ze u hebben verzonden.