According to the Project Management Body of Knowledge (PMBOK), one of the key responsibilities of a project manager is to ensure that lessons learned from previous projects are applied to current projects. This helps to avoid repeating the same mistakes and to leverage successful strategies. In this scenario, the project manager should share the lessons learned from the previous project with the team member. This will not only help to resolve the current issue more efficiently but also contribute to the team member's learning and development. References: PMBOK Guide, 6th Edition, Section 4.4.3.1 - Lessons Learned Register

When a project team is struggling to obtain the required data, it is essential for the project manager to directly address the issue with the data suppliers. By meeting with the suppliers, the project manager can clarify the critical timing requirements and the importance of the data for the project's next stage. This proactive approach is in line with the PMBOKGuide's emphasis on stakeholder engagement and communication management as key aspects of project management123.
References: = PMBOKGuide and Standards foundational documents; Professional in Business Analysis (PMI-PBA) reference materials.

According to the PMBOK Guide, an iterative-based strategy is a release strategy that delivers the product incrementally over multiple iterations, each adding more functionality and value. This strategy allows the project team to obtain early feedback from the customers and stakeholders, and to adapt to changing requirements and priorities. In this scenario, the project manager should recommend an iterative-based strategy to maximize value by releasing the product to each country as it is finalized and ready for release in that country. This will help to meet the specific requirements of each country, and to deliver value faster and more frequently. References: PMBOK Guide, 6th edition, page 19-20. PMP Questions page 515, question
515. PMP Practice Exam, question 4.

In project management, it's important to maintain open and transparent communication with all stakeholders, including unsuccessful bidders. Meeting with the unsuccessful bidder not only provides them with feedback but also maintains a good relationship with them, which could be beneficial for future projects. This approach aligns with the principles of stakeholder management and communication management in project management practices. References:
https://bordio.com/blog/how-to-become-a-project-manager/
https://www.indeed.com/career-advice/career-development/how-to-become-a-project-manager