When a project manager identifies stakeholders who will be impacted by the delivery of a new product, it is important to update the communication plan to reflect these findings. This ensures that all stakeholders are informed about the project's progress and how it may affect them, fostering transparency and managing expectations.
Reference = The answer is based on standard project management practices and the typical use of communication plans in stakeholder management. For detailed information, please refer to the CompTIA Project+ Study Guide and other official CompTIA resources.

The project manager should hold sessions to understand user challenges and track system usage and report user activity. These steps will help the project manager to identify the root causes of the adoption issues and monitor the progress of the system utilization. They will also help to communicate with the sales organization and provide feedback and support12

The project manager should inform the project sponsor about the issue and seek their guidance and support.
The project sponsor is the person who provides the resources and authority for the project, and who can help resolve any conflicts or problems that may arise. The project manager should not withdraw the offer, ignore the lawsuit, or use a third-party company without consulting the project sponsor first, as these actions may have legal, ethical, or financial implications for the project and the organization12.

Electronic document and record management systems would be the best software solutions to help an institution manage the internal flow for formally responding in writing to citizens' complaints. Electronic document and record management systems are software systems that help organizations create, store, organize, manage, track, and distribute electronic documents and records. Electronic document and record management systems can help to improve efficiency, productivity, collaboration, compliance, and security of document and record management processes and workflows3