The sprint retrospective is an integral part of the agile approach, providing an opportunity for the project team to inspect and adapt their processes. When the product owner has concerns about the sprint results, it is important to address these in a retrospective meeting. This allows the team to openly discuss what went well, what didn't, and how they can improve in the next sprint. It's a collaborative effort to enhance the quality and effectiveness of the team's output and to ensure alignment with the product owner's expectations12.
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Scrum.org resources on Sprint Review3.
PMBOK Guide - Seventh Edition4.
Professional in Business Analysis (PMI-PBA) Reference Materials5.