According to the Project Management Body of Knowledge (PMBOK) guide, effective stakeholder engagement is crucial for the success of a project. The project manager should schedule regular meetings with the key stakeholder to provide updates and receive feedback. This will ensure that the stakeholder is kept informed about the progress of the project and can provide valuable input. Additionally, promoting an adaptive and transparent environment where the team can easily communicate with the stakeholders will help in building trust and improving the relationship with the stakeholder. References: PMBOK Guide, 6th Edition, Section 13: Stakeholder Management