A product owner worked with the customer to define the success criteria for the launch...

The product owner should work closely with the team to ensure that the most critical features are prioritized and clearly understood. Inviting the customer to the sprint planning meeting helps ensure that the team has a direct understanding of what is most important to the customer and their business needs. This fosters collaboration and ensures the team works on the most valuable features first.

Additionally, refining the product backlog and identifying the Minimum Viable Product (MVP) ensures the team knows the minimum set of features required for the product to provide value to the customer. By focusing on the MVP, the team can quickly deliver a product that addresses the core needs, enabling faster feedback and iterations.