Source?
>Note: To use passkeys, iOS 16, iPadOS 16, macOS 13, or tvOS 16 (or later) is required. iCloud Keychain and two-factor authentication must also be turned on.
https://support.apple.com/guide/iphone/use-passkeys-to-sign-...
>Note: To use passkeys, iOS 16, iPadOS 16, macOS 13, or tvOS 16 (or later) is required. iCloud Keychain and two-factor authentication must also be turned on.
https://support.apple.com/guide/iphone/use-passkeys-to-sign-...