Sign-in Trouble while trying to log-in office 365 school account

Hello,

I have a problem with my school account. When I am trying to log-in to office 365, The system always redirects me to my school's website ot password reset because of "Your account is at risk.". I am changing my pass and then this situation becomes a loop. Change password, Try new one and change again. Try more...

I need help with access my school account.