Final answer:
LEED Online does not allow project team members to manage public-facing project details.
Step-by-step explanation:
The action that cannot be performed by a project team member using LEED Online is Managing public-facing project details. LEED Online is a platform that allows project team members to access web-based reference guides, coordinate resources among team members, and submit technical inquiries regarding LEED credits. However, it does not provide the capability to manage public-facing project details.