PMP Practice: Promote the Shared Vision

Nikolai Volkov-Sorokin is leading an agile team at Sourdough Signal Corp developing a carbon-tracking mobile app for small businesses. Three sprints in, team members are pursuing different priorities: the UX designer wants to focus on gamification features to increase user engagement, the backend engineers are prioritizing data accuracy and API integrations, and the product owner is pushing for rapid feature delivery to meet an investor demo in two weeks. During the last retrospective, team members expressed frustration that 'we're building different products.' Velocity has dropped 30% as the team debates priorities in daily standups. The product owner has asked Nikolai to 'just tell everyone what to do so we can move faster.' Which approach would be MOST effective for realigning the team around a common vision?