It is possible that you might forget to unlock the HR account while installation at the Password Management section.
ALTER USER HR ACCOUNT UNLOCK IDENTIFIED BY S0m3P@ssw0rD;
In order to execute this command, the user must have privilege of SYSDBA.
For some reason, if you need to lock the HR account ,
ALTER USER HR ACCOUNT LOCK;
This command will just lock the user, but the data and the password for the account is still valid for use once the account is unlocked by the SYSDBA.