In an agile software development project, the project manager should focus on collaboration and communication to resolve issues. When a client complains that the last deployment did not meet the acceptance criteria, it's crucial to review the requirements traceability matrix. This matrix is a document that links requirements throughout the validation process, helping to ensure that all requirements defined for a system are tested in the test protocols. By reviewing this matrix with the team lead and the client, the project manager can identify any discrepancies between the client's expectations and the team's understanding of the specifications. This collaborative approach can help to resolve the issue effectively. References: Project Management Professional (PMP) Reference Materials, Professional in Business Analysis Reference Materials