To address the lack of collaboration from the Product Owner during the Sprint, the Scrum Master can take the following valuable actions: Bringing up the problem in the Sprint Retrospective allows the team to discuss and identify issues, and collectively decide on improvements. Coaching the Product Owner in Scrum values and incremental delivery helps to align their understanding and approach with the team's workflow, fostering better collaboration and adherence to Scrum principles. These actions support continuous improvement and the effectiveness of the Scrum process.