Admin: user has full administrative access to all networks and organization-wide settings. This is the highest level of access available.
Viewer: user is able to access most aspects of network and organization-wide settings, but unable to make any changes.
Admin: user has access to view all aspects of a network and makes any changes to it.
Viewer: user able to access most aspects of a network, including the configuration section, but no changes can be made.
Front desk: user is able to access the front desk portal to generate guess passes and manage guest passes only.
If you want to choose the network permission to front desk/viewer, please change the organization permission to viewer/none, and then you will find the options displayed on network.
Change organization permission to viewer , then you can change the network permission to admin/viewer
Change organization permission to none, you can find the front-desk permission