In standups a team member has given the same update for five days. That task is on the critical path and now risks delaying the schedule. What should the project manager do?

The project manager's primary role in an agile environment is to facilitate and remove impediments. If a task is stalled, especially one on the critical path, the most effective action is to directly address the issue with the team member. There might be a blocker they are unable to resolve alone. Asking about impediments and offering support aligns with servant leadership and problem-solving. Informing the sponsor is premature without understanding the root cause or attempting to resolve it. Reassigning the task or adding resources without understanding the problem could be inefficient, demotivating, or ineffective if the underlying issue isn't addressed.