Troubleshooting Detail

Dear @KateleenAnne Forca,

I hope you’re having a good day. 

Thank you for providing the error details.

The "error code 399287 " is commonly associated with an identity verification or multi-factor authentication (MFA) issue during the sign-in process, rather than a Microsoft Teams application issue itself. In similar cases, the sign-in succeeds up to the authentication stage, but the account cannot complete the required verification method.

Could you please help clarify a few details?

• Is this a school account, work account, or personal Microsoft account?
• At which step do you encounter the error?

If this is a school account, please note that MFA settings are typically managed by your organization's IT administrator. I would recommend contacting your school's IT administrator as well. They can verify whether there are any issues with your account and, if necessary, reset or update your registered authentication methods.

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?

I hope this information helps point you in the right direction.

Warm regards,  

If the answer is helpful, please select "Yes, accept answer". If you have any questions or new updates, please feel free to comment below.