Explanation:

Inviting the manager to the scheduled sprint review aligns with the principles of stakeholder engagement and communication management as outlined in the PMBOK Guide. It encourages transparency and provides an opportunity for early feedback, which is beneficial for the project's success. The PMBOK Guide emphasizes the importance of involving stakeholders and keeping them informed about the project's progress.
By inviting the manager to the sprint review, the project manager is adhering to these best practices.
= PMBOK Guide1; PMP Examination Content Outline2; Professional in Business Analysis Reference Materials3.

The PESTLE analysis is a tool that can help project managers identify and understand the broader external factors that they might need to consider when planning a project. In this scenario, the project manager is dealing with new regulations from several government agencies that will affect the solution. These regulations can be considered as legal factors in a PESTLE analysis. By using PESTLE, the project manager can assess and prioritize the impact of these changes on the project scope/backlog. References: Professional in Business Analysis Reference Materials source and documents

In an agile project, when there is a disagreement about a major new requirement among key stakeholders, the project manager should facilitate a meeting with the stakeholders and product owner to clarify the new need.
This approach ensures that all parties have a clear understanding of the requirement and can work towards a common goal. It also helps to prevent potential issues that could arise from misunderstandings or miscommunications. References: PMBOKGuide - Sixth Edition, Section 13.2.2.1: Plan Stakeholder Engagement