According to the Project Management Professional (PMP) principles, a project manager should actively engage with team members to identify and resolve issues. In this scenario, the project manager should meet with the designer to understand the challenges and work collaboratively to find a solution. This approach promotes open communication, problem-solving, and maintains the momentum of the project. References:
PMBOKGuide - Sixth Edition, Section 9.5.2.1: Manage Team

According to the PMBOK guide, one of the principles of agile project management is to empower the team to self-organize and make decisions about how to best accomplish their work. Self-organizing teams are more likely to be motivated, creative, and productive, as they have a sense of ownership and autonomy over their work. Self-organizing teams also have the ability to inspect and adapt their processes and practices based on feedback and learning. Therefore, when a team faces recurring issues, the project lead should not intervene or impose solutions, but rather facilitate the team's reflection and improvement. The project lead can use techniques such as retrospectives, which are meetings where the team reviews their performance and identifies what went well, what did not go well, and what actions they can take to improve. The project lead can also help the team to update their team working agreement, which is a document that defines the team's norms, values, and expectations. A team working agreement can help the team to align on their goals, roles, responsibilities, and communication methods, as well as to resolve conflicts and issues. The project lead should not notify senior management, challenge the team, or post the agreements, as these actions may undermine the team's trust, autonomy, and accountability. References:
* PMBOK guide, page 18, section 1.2.3, Agile Considerations in Project Management
* PMBOK guide, page 437, section 11.2.2.3, Meetings
* Creating a Team Working Agreement

The best approach for the project manager in this situation is to encourage the team member to concentrate on the current project and view past conflicts as opportunities for learning and growth. This aligns with the PMI's emphasis on conflict resolution through collaboration and problem-solving, where team members work together to identify underlying causes of conflicts and find mutually beneficial solutions12. Additionally, it is consistent with the PMBOK guide's approach to conflict management, which includes problem-solving as a key technique3.
References:
* Managing conflict - project environment - Resolution Strategies1.
* Conflict Resolution in Teams: Embracing PMIisms for Success2.
* 5 Conflict Resolution Techniques in Project Management - PM Study Circle3.

The first step the project manager should take to gather customer requirements for an information security project is to conduct a stakeholder analysis. A stakeholder analysis is a technique that helps identify the key stakeholders, their needs, expectations, interests, and influence on the project. By conducting a stakeholder analysis, the project manager can understand how regional policies may affect the customer requirements, such as legal, regulatory, cultural, or ethical factors. A stakeholder analysis can also help the project manager prioritize the requirements and plan the communication and engagement strategies with the stakeholders. References: = PMBOKGuide, Sixth Edition, pages 513-515; A 6-step guide to requirements gathering for project success, Step 1: Assign roles.

Consensus building in project management, especially with diverse team members, involves creating an environment where agreement is reached through open and inclusive discussion. This approach encourages participation from all team members, ensuring that each voice is heard and considered. It helps in identifying common ground and facilitates the integration of various perspectives into a cohesive plan. The process is respectful, efficient, and productive, leading to decisions that are accepted by all and fostering commitment to the project's execution.
: = How to Build Consensus in Project Management - LinkedIn1, Creating Collaboration in Diverse Teams - LinkedIn2, How to Build Consensus in a Diverse Team - LinkedIn3, How to Build Consensus Among Diverse Team Members - LinkedIn4.