In an agile project, the project manager should collaborate with the stakeholders and ensure their active involvement in the project. The project manager should meet with the unhappy stakeholder to understand their concern and the business impact of the delayed delivery. The project manager should also reprioritize the product backlog as necessary to accommodate the stakeholder's needs and expectations. Finally, the project manager should invite the stakeholder to join the sprint planning session, where the team selects the work to be done in the next iteration based on the stakeholder's feedback and the product owner's guidance. This way, the project manager can improve the stakeholder's satisfaction and engagement, and foster a trusting and collaborative relationship. Directing the product owner to drop other work in progress and work on the stakeholder's requirement as the top-priority item may not be the best option, as it may disrupt the team's flow and compromise the value delivery. Sharing the prioritized items that the team is working on with the stakeholder and inviting them to join the sprint planning session may not be sufficient, as it does not address the stakeholder's concern and business impact. Securing some additional funding to recruit more resources to the project team to enable faster delivery may not be feasible or effective, as it may violate the agile principle of simplicity and increase the complexity and communication overhead of the project. References:
* A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Seventh Edition, Chapter 14: Team, Section 14.2: Enable Team Performance, Section 14.3: Lead the Team
* Agile Practice Guide, Chapter 2: Life Cycle Selection, Section 2.2: Implementing Agile: Creating an Agile Environment, Section 2.3: Implementing Agile: Delivering in an Agile Environment
* Professional in Business Analysis (PMI-PBA) Handbook, Section 2.3: Domains and Tasks, Domain
4: Analysis, Task 9: Validate Requirements
* [Professional in Business Analysis (PMI-PBA) Examination Content Outline], Domain 4: Analysis, Task 9: Validate Requirements