When faced with a key stakeholder who is refusing to participate and disagrees with the project team's approach, it is essential for the project manager to engage in proactive communication to resolve the disagreement. Scheduling a meeting as soon as possible allows for an open dialogue where concerns can be addressed, and a mutually agreeable approach can be developed. This aligns with the principles of stakeholder engagement and communication management as outlined in the PMBOK guide, which emphasizes the importance of involving stakeholders in decision-making processes and resolving issues through collaboration1.
References:
PMBOK Guide and Standards1
Project Management Academy article on handling unresponsive key project stakeholders1 ExamTopics discussion on similar PMP exam question2

In Agile project management, the iteration review is a meeting held at the end of an iteration where the team demonstrates the work completed during the iteration. This event is an opportunity for the project manager to show the business stakeholders the integrated features in action, thus addressing their concerns about understanding the feature integration with the product. It allows stakeholders to see the tangible results of the development efforts and provides a platform for immediate feedback.
: The answer is based on general Agile practices and the role of iteration reviews in Agile project management, which are commonly included in PMP study materials and the PMBOK guide.