A scrum master is part of a team that has just agreed on the project...

The first step for the Scrum Master should be to identify the key stakeholders as early as possible. Understanding who the key stakeholders are, such as internal or external individuals or groups that have an interest in the project, allows the team to prioritize communication and engagement with them from the outset. Identifying stakeholders early ensures that their needs and expectations can be taken into account when planning and executing the project. This helps avoid misunderstandings or misaligned goals later in the project.