On a global project, planning reveals team members from different regions are unwilling to collaborate. What should the project manager do?

The correct answer is to hold a meeting to understand the issues and resolve the conflicts. This is a proactive and direct approach to address the identified problem. By facilitating a meeting, the project manager can create an open forum for team members to voice their concerns, identify the root causes of the unwillingness to collaborate (e.g., cultural differences, communication barriers, competing priorities), and collectively work towards solutions. This aligns with conflict resolution techniques in project management, emphasizing early intervention and direct communication. Reviewing organizational culture, structure, and governance is too broad and might not directly address the immediate team conflict. Coordinating with regional managers might be a later step if the team meeting doesn't resolve the issue, but the initial focus should be on the team itself. Reviewing lessons learned is helpful for future planning but won't resolve the current conflict.