Which portal offers a quick way to add users and set permissions?

The correct answer is the Microsoft Power Platform Admin Portal. This portal provides a user-friendly interface designed specifically for administrators to manage their Power Platform environments. It allows for seamless user management, including adding users and setting permissions quickly and efficiently.

In this portal, administrators can easily navigate to the "Users" section, where they can invite new users to the environment and assign roles or permissions without getting bogged down by complex configurations. The intuitive design streamlines the process, allowing for efficient handling of user management tasks.

While the other portals mentioned also have administrative functions, they are not as specialized for the rapid management of users and permissions as the Microsoft Power Platform Admin Portal. The Classic Administration Center is more geared towards legacy settings and may involve more manual steps. The Power Apps Admin Portal, although useful, is less comprehensive for broader Power Platform functionalities compared to the dedicated Power Platform Admin Portal. The Power Apps Advanced Customization primarily focuses on customizing applications rather than managing users directly.