User Must Change Password at Next Logon Grayed Out

I know the answer is simple, but I'm having a brain fart. In Active Directory on Server 2012 R2 Standard, I as a domain administrator cannot check the box requiring a user to change his password at next logon while resetting his password. It's grayed out.

I am trying to delegate access to an OU so that Help Desk users can reset passwords (done) and force the user to set a new one on logon (not done). In troubleshooting it, I realized that not even a domain admin can do it!

What has to be changed to get this box to be clickable?
highdellAsked:
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arnoldCommented:
Make sure "user can not change password" is not checked/set.

I think that is the only possible, presumably password never expires is not impacting, but ...

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highdellAuthor Commented:
... and THERE it is. I knew it was something simple. I just COULD NOT recall it for the life of me. "Password never expires" checkbox was checked in ADUC.
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