Error: The referenced account is currently locked out and may not be logged on to. (Exception from HRESULT: 0x80070775) from our school 365 email account

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  I am a student from City University of Hong Kong and the user of Microsoft 365 email account.
  However, after changed my password once, I cannot log on the account. 

  I received the below message when I was trying to reset my password.
  
  Error: The referenced account is currently locked out and may not be logged on to. (Exception from HRESULT: 0x80070775) 
  

  Could I know what wrong with my email account? What should I do?
  
  Thank you!!
  

  Monday, September 30, 2013 1:40 PM