To me the having a project kickoff meeting is the perfect time to get the team to understand the business need, direction, or vision and allows the people involved in the project to get excited, set expectations for how the project is going to run, and setting accountability upfront of what is expected at the end of the project.
At the kickoff meeting, which to me is typically facilitated by the Scrum Master, and lead by the Project Owner/Manager is to make sure everyone understands the expectations, and how everyone would be held accountable during the project. This could be making sure that each team or individual involved is aware of what needs to be completed and who is responsible for each part of the project.
Accountability to me is built-in and the Project Owner/Manager is ultimately responsible for the project’s overall success, but in order to succeed, the Project Owner/Manager needs to set those expectations for everyone to understand who is accountable and to be able to hold each other accountable.