Unable to turn on iCloud Keychain
I'm having issues trying to enable iCloud Keychain on an iPhone 8 Plus. From Settings => Apple ID => iCloud => Keychain I'm switching it from Off to On, which stays like that (green) until I go back to the previous menu (i.e. iCloud), then I see the Keychain option being back to the Off state.
Anyone encountered anything like that?
iPhone 8 Plus, iOS 12