Accessing Outlook on the web for business using organizational credentials.
Hi @Ha - Nhu,
Based on the email address you provided, this appears to be a school account. Please try resetting your password by following the steps in this article: Reset your work or school password using security info.
If self-service password reset is unavailable or you cannot complete the verification, please contact your school’s IT administrator or IT help desk. For reference: How do I find my Microsoft 365 admin?
Your school manages this account, so its IT team or administrator has the appropriate access to help reset your password if necessary.
I sincerely hope this information helps direct you to the correct support team so that you can regain access to your account and continue your studies without further interruption.
Thank you for taking the time.