A leader from project B consistently reaches out to a team member in project A for assistance. What should project A's project manager do?

Telling a team member to ignore another project leader is unprofessional and fails to address the underlying cross-project dependency or resource allocation issue appropriately.

The project manager for Project A needs to address potential resource contention, scope creep for the team member, and overall impact on Project A's deliverables and schedule. Communicating directly with Project B's leader ensures transparency and allows for a coordinated solution that considers both projects' needs and prevents unauthorized work.

While relationship building is valuable, allowing uncontrolled direct requests can lead to resource conflicts, overwork for the team member, and jeopardize Project A's commitments.

While ensuring Project A's work is completed is important, simply ensuring completion does not proactively address the root cause of the unauthorized resource usage or the breakdown in cross-project communication.