According to the Project Management Professional (PMP) guidelines, effective communication is crucial for the success of a project. In this scenario, the project manager is facing challenges with the current communication channels. The best course of action is to collaborate with the project team and agree on a suitable communication method that ensures information is shared promptly and effectively. This proactive approach can help avoid delays and negative consequences for project delivery. References: PMBOK Guide, Communication Management. Please refer to the specific sections in the PMBOK Guide and PMP study materials for more detailed information.