By upgrading to iOS 16.2, iPadOS 16.2, and macOS 13.1 (expected to be released next week), Apple users can expect to enable iCloud’s Advanced Data Protection feature, which enables end-to-end encryption for Photos, Notes, Reminders, Voice Memos, and many other services.
To better protect users, new devices under Apple ID accounts will need a buffer period to enable Advanced Data Protection. According to some user screenshots, this feature will not take effect until the end of January or the beginning of February.
In the reminder, it is written
"Because this device was recently added by you, Advanced Data Protection cannot be enabled until February 2, 2023. We will help protect your account and data during this waiting period."
Older devices already added under an Apple ID account, however, have Advanced Data Protection enabled as normal. In this case, all devices added to that Apple ID account are fully protected by iCloud Extended End-to-End Encryption, including newer devices that are still in the waiting period.