An auxiliary or short-term temporary (seven months or less) assignment was used to fill a position I’ve been waiting to be posted and compete for. May I request a staffing review to challenge these types of appointments?  

No. Section 10 of the Public Service Act exempts short-term temporary appointments from staffing reviews. This means that although auxiliary and short-term temporary appointments must be based on the principle of merit, a competitive process is not required. You cannot use the staffing review process to dispute this type of appointment.