DeviceManagementManagedDevices.Read.All
— application permission, granted to the app registration with admin consent.
Licence: Microsoft Intune; Apple Business Manager for ADE.
Endpoint:
GET /v1.0/deviceManagement/managedDevices (isSupervised, deviceEnrollmentType, managedDeviceOwnerType)
If a permission is missing, this report shows a red load error with the Graph status code — not an empty table.
Unsupervised iOS / iPadOS Devices
Supervision is what lets Intune enforce single-app mode, block iCloud backup, silently install apps and prevent the user from removing management. A corporate iPhone that is not supervised is effectively a personal phone with a profile - and it can only be supervised by wiping it and enrolling through Automated Device Enrollment (Apple Business Manager).
No iOS or iPadOS devices are managed by Intune.