Unable to verify login using the phone number method

Question

Unable to verify login using the phone number method

Tri Tran 0

I'm having trouble signing in to my Microsoft account. When I try to verify my identity, I get the following message:

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

The verification methods (Microsoft Authenticator app and phone number) are not working. I’ve tried using both the verification code and text message options, but neither method allows me to complete the sign-in process.

Here are the troubleshooting details shown on the screen:

Error Code: 399287

Request Id: <PII Removed>

Correlation Id: <PII Removed>

Timestamp: 2025-11-02T10:20:07Z

Could someone please help me understand what this error code means and how to fix the issue? User's image

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1 answer

Your answer

Answer 1

Hello Tri Tran

Thank you for posting question to Microsoft Q&A Forum.
Please understand that our forum is a public platform, and we will modify your question to cover your error information in the description. Please note that you should hide this personal or organizational information the next time you post a bug or some information to protect personal data.

According to this issue, may I know if there are other Global Administrators in your organization? If so, they could follow this article to reset MFA for you: https://learn.microsoft.com/en-us/entra/identity/authentication/howto-mfa-userdevicesettings#manage-user-authentication-options

However, if you are the only Global Administrator - then you will need to follow either these steps:

Call to Microsoft Support team - please look for phone number matching with your country: Customer service support phone
If method 1 is not working, please follow this link to create a trial tenant: https://www.microsoft.com/en-us/microsoft-365/business/microsoft-365-business-basic?msockid=3eb6980b5c6860e63a588d0c5d1761d6 - after that you will be able to access to Microsoft 365 Admin Center to raise the ticket - please mention that you are raising ticket on behalf of the affected tenant that you do not have access to. The support team will help you to create ticket on the affected tenant then later on the Microsoft Data Protection team will assist you.

Please note that this process will take more time than usual (7-14 working days) for your account to get access again as DataProtection is always overwhelmed with the number of tickets. As I am forum moderator, I do not have access to Microsoft internal system to assist or push this process to be quicker.

I hope my information is helpful. Please give me any updates once you get this resolved.

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Tri Tran 0 Reputation points

2025-11-16T05:44:38.6+00:00

The account I am using to log in is the only admin account. Could you guide me on how to request a reset of the phone-number login method? This is a valid phone number originating from Vietnam.
Jack-Bu 6,865 Reputation points Microsoft External Staff Moderator

2025-11-17T11:02:46.9333333+00:00

Hi Tri TranI'd love to help, but as a Forum Moderator, I’m not able or authorized to access or make changes to your tenant. In this case, you’ll need to reach out to one of your Global Admins (if available) to update your MFA settings, or contact Microsoft through a trial tenant to request access to a locked-out tenant.