Managing security and data access is a critical challenge for Power BI consultants, especially when dealing with multiple user roles and sensitive data. Power BI consultant must implement row-level security (RLS), dynamic security filters, and object-level security (OLS) to control access to reports and dashboards. Ensuring that data encryption, user authentication, and compliance with regulatory standards (GDPR, HIPAA) are met is essential. Additionally, consultants must educate clients on proper data-sharing protocols and manage workspace permissions effectively to prevent unauthorized access. Careful planning and testing are key to ensuring data security and privacy in Power BI solutions.