The best course of action is for the project manager to facilitate a session with all stakeholders to discuss, agree upon, and document the benefits and their ownership. This aligns with the PMP objectives of engaging stakeholders in the project decision-making process, including benefit analysis and distribution. It ensures that all parties have a clear understanding and agreement on how the benefits will be shared and utilized, which is crucial for project success and stakeholder satisfaction.
References: = This approach is supported by the PMI's guidance on conducting benefit analysis with stakeholders to validate project alignment with organizational strategy and expected business value1. Additionally, the PMI's standards on project benefit management emphasize the importance of defining and appraising target benefits during project initiation, which includes stakeholder involvement2.