A technical lead has complained to the project manager about a team member's performance.

In a situation where a team member has repeatedly missed tasks that have put sprint commitments at risk, the project manager should first seek to understand the situation from the team member’s perspective. This involves meeting with the team member to discuss the issues at hand. The project manager can then provide constructive feedback and work with the team member to develop a plan for improvement123. This approach aligns with the principles of effective project management and team leadership, as it promotes open communication, problem-solving, and continuous learning. References: 

https://www.workzone.com/blog/missed-deadline/

https://pm.stackexchange.com/questions/611/how-to-deal-with-a-team-member-who-keeps-missing-deadlines