Building a mobile app from a Pega Platform application requires configuring certain key components for security and connectivity. Creating a certificate set (A) is essential for securing the app, ensuring that communications between the mobile app and the server are encrypted and authenticated. Configuring access to the Pega Mobile Build Server (B) is necessary for the app build and distribution process, allowing the Pega application to package and deploy mobile apps through Pega's cloud-based build service.References: Pega Community documentation on mobile app development and deployment.