You need a paid iCloud subscription to access some of the features introduced in the latest versions of iOS and iPadOS. Unveiled with iOS/iPadOS 15, iCloud+ is an enhanced upgrade to iCloud that adds privacy and security options such as iCloud Private Relay and Hide My Email. via Technology and News Today https://www.techrepublic.com/article/how-to-upgrade-your-icloud-account-to-icloud/