What are two user roles trial you ate allowed to assign to a new account?

Installer: The installer role is designed for users who need access to configure and deploy Mist devices. This role typically has the necessary permissions to set up and manage devices but with limited access to other administrative functions​(CertsHero)​.

Network Admin: The network admin role provides comprehensive access to manage network settings, monitor performance, and configure policies. This role is essential for users responsible for the overall network administration and maintenance​(CertsHero)​.

References:

Juniper Networks Documentation