Some communication best practices that a BA should follow to become a trusted advisor to UC stakeholders are:

Ask questions and document the answers: This helps to understand the stakeholders’ needs, expectations, pain points, goals, and priorities. It also shows interest and curiosity in their perspectives and opinions, and helps to clarify any assumptions or ambiguities.

Make suggestions based on previous project success: This helps to demonstrate expertise and experience in Salesforce implementations, and provide valuable insights and recommendations for UC stakeholders. It also shows confidence and credibility in delivering solutions that meet their needs.

Provide a meeting agenda prior to each session: This helps to set clear expectations and objectives for each meeting, and ensure that all relevant topics are covered. It also shows respect for the stakeholders’ time and availability, and helps to keep the meeting focused and productive. References: https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-stakeholder-management/communicate-with-stakeholders