A distributed project team on an iterative project adopted a new communication mode after health protocol changes. Co-located members are struggling to follow verbal communication and collaborate effectively. What should the project manager do?

The project manager should organize a team meeting to address and resolve the communication challenges. This is the most direct and effective approach to understand the specific issues co-located members are facing with the new communication mode and to collaboratively find solutions. It fosters team ownership of the problem and its resolution, which is crucial in an iterative environment. Adding collaboration tools to the communications management plan might be a solution, but it's premature without first understanding the root cause through team discussion. Allowing collaboration to gradually improve is a passive approach that risks further deterioration of team effectiveness and morale. Escalating to the project sponsor is an overreaction at this stage; the project manager should first attempt to resolve team-level issues internally.