Passwords system value controls whether the password must be different from previous passwords. This value provides additional security by preventing users from specifying passwords that were used previously. It also prevents a user whose password has expired from changing it and then immediately changing it back to the old password. For user password settings, please look at here: https://search400.techtarget.com/answer/Changing-user-password-settings.
It depends on the value changed. What value are you looking to change? If you have never had a password expiration then the next time they log in they will have to set a new password and follow the new rules.
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