Apple devices running iOS 10 or macOS Sierra no longer meet the minimum system requirements for accessing iCloud. According to Apple’s updated iCloud support document, All iCloud feature now require a device running at least iOS 11 or macOS High Sierra at the minimum.
This means older iPhones, iPads, and Macs that run iOS 10 or macOS Sierra, or older versions of Apple’s operating systems will no longer be able to us iCloud services like Keychain, iCloud Photos, iCloud backups, Find My, and iCloud Drive.
iOS 10 and macOS Sierra both launched in September 2016, making the software nine years old. Devices running either operating system will no longer be able to access iCloud services.
