This answer states that documenting user requirements from each department during discovery sessions is what the BA should do to get buy-in from users for preparing for a new Sales Cloud implementation for 6,000 users at CK. User requirements are the needs, expectations, and objectives of the users for the Sales Cloud implementation. Discovery sessions are meetings or workshops where the BA gathers and clarifies user requirements from different stakeholders. Documenting user requirements from each department during discovery sessions means that the BA records and organizes the information obtained from different stakeholders from different departments, such as manufacturing and delivery, in a clear and concise way.
Documenting user requirements from each department during discovery sessions is what the BA should do to get buy-in from users for preparing for a new Sales Cloud implementation because it helps the BA to understand and validate the user requirements, and to communicate and align them with the project scope and goals. References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-quick-look/use-stakeholder