Explanation:
Box 1: Azure AD and a security role.
Call center must log customer issues.
Box 2: Authenticated user and a web role
The Repair Service Customer is not going to have an Azure AD identity.
Box 3: Authenticated user and a web role
Third-party technicians must be able to access assigned repair service jobs.
Before you grant authenticated users access to table permissions or restricted pages, they must first be assigned to a web role.
Authenticated users
Enabling the Authenticated Users Role makes it the default web role for all users. This role is commonly used to provide a predetermined access for users that aren't associated to any other roles. Keep in mind that users can have multiple web roles, but there can only be one Authenticated Users web role for authenticated users.
Reference:
https://docs.microsoft.com/en-us/power-platform/admin/database-security
https://docs.microsoft.com/en-us/power-pages/security/create-web-roles