Problem with MFA

Question

User has Microsoft 365 Personal and his license will expire in 10 days. However he can't sign in to his account because MFA is not working. He has set an SMS MFA and when he try to log in system shows error code: 399287 - Unfortunately, we are experiencing difficulties verifying your account. What can he do?

Answer 1

Hello Gabrijela Vratarić,

I understand that you cannot sign in to your Microsoft 365 Personal account because SMS verification fails with error 399287.

Please avoid repeatedly requesting new codes, as excessive attempts may temporarily block verification. On the sign-in page, select Sign in another way or Other verification options and use another registered method, if available.

If SMS is the only option, use the Microsoft account Sign-in Helper to check the account and view the available recovery or support options:

Use the Microsoft account Sign-in Helper

You can also review Microsoft’s official guidance here:

Troubleshoot Microsoft verification code issues

Please note that community moderators and Microsoft Support cannot manually send a verification code or bypass the account’s security verification. If the Sign-in Helper cannot resolve the issue, select the available option to contact Microsoft Support. Here is how you can contact them:

Please note that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, are not allowed to directly interfere with Microsoft product features or access back-end systems. Our role is limited solely to providing technical guidance on reported incidents, requests, or ideas.  

1. Open a website link - Contact - Microsoft Support 
2. In the box below "We're here to help", type Microsoft 365, click "Get Help", and then click "Contact Support" below. 
3. In this section, you will need to sign in to your Microsoft account. 
4. Select "Microsoft 365 and Office" under Products & Services, select "Technical Support" as the category, and click to confirm 
5. You can select " Chat with a support agent in your web browser " to access the chat window. 

I hope you can get the support you need, have a nice day.