A team member performed poorly for two iterations. After two feedback sessions and escalation to the resource manager and sponsor, there is no improvement. What should the project manager do next?

The project manager has already taken several steps, including providing feedback and escalating to the resource manager and sponsor, without improvement. At this point, the most practical and effective next step is to request a new resource. This ensures the project's progress isn't further jeopardized by continued underperformance. Addressing the obstacle during a daily standup is inappropriate for a persistent, severe performance issue that has already been escalated. Escalating to the sponsor again without a new proposed solution is unlikely to yield different results. Providing feedback at the sprint review is too late and doesn't solve the immediate problem of poor performance impacting the current iteration.