Special Desktop Tech rights in active dir., need to change ability to force password change.

Greetings,

I am a new employee in an IT department. Not new to IT, just this company.
I was given an assignement to fix or edit a security group policy.
The name of the policy is:  PasswordChange.
This was created so the desktop techs can reset domain passwords.
the problem, in the pop-up window to reset a password, there is the small check box to force the user to reset change their password at next login.
This is greyed out for these tech users. *See attached pic*

I need to find out how to enable this function for these guys.

Thanks in advance.