The project manager should use the collaborate/problem solve technique to resolve this issue, as it involves finding a mutually beneficial solution that satisfies the interests of both the senior and junior team members.
This technique is also known as confronting or integrating, and it is the preferred technique for managing conflicts on a project. The project manager should facilitate a constructive dialogue between the two team members, identify the root cause of the conflict, and help them reach a common understanding and agreement.
This way, the project manager can maintain a positive team environment and foster collaboration and trust among the team members. References: (Professional in Business Analysis Reference Materials source and documents)
* PMBOK Guide 6th Edition, page 368, section 9.5.2.1
* PMI Practice Standard for Project Risk Management, page 37, section 3.5.2.1
* PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline, page 13, section
3.2.1.1