Corporations with 100,000+ users can operate with just 3 Global Admins.
Here’s some interesting roles & their permissions requirements:
- Multi-factor authentication
https://docs.microsoft.com/en-us/azure/active-directory/users-groups-roles/roles-delegate-by-task#multi-factor-authentication - Authentication Administrator permissions
https://docs.microsoft.com/en-us/azure/active-directory/users-groups-roles/directory-assign-admin-roles#authentication-administrator-permissions - Compliance Administrator
https://docs.microsoft.com/en-us/azure/active-directory/users-groups-roles/directory-assign-admin-roles#compliance-administrator - Conditional Access Administrator
https://docs.microsoft.com/en-us/azure/active-directory/users-groups-roles/directory-assign-admin-roles#conditional-access-administrator - Desktop Analytics Administrator
https://docs.microsoft.com/en-us/azure/active-directory/users-groups-roles/directory-assign-admin-roles#desktop-analytics-administrator - Emergency Options
https://docs.microsoft.com/en-us/azure/active-directory/authentication/concept-resilient-controls#emergency-options