A project manager meets with external stakeholders to explain the objectives and outline expectations for...

The project manager should inform the sponsor and document the request in the stakeholder engagement plan, as this is the best way to handle the situation without compromising the project scope, budget, or schedule. The sponsor can then decide how to deal with the key stakeholder’s request, and the project manager can update the stakeholder engagement plan accordingly. This will also help the project manager to maintain a positive relationship with the key stakeholder and avoid any potential conflicts or misunderstandings.