From Apple documentation; What happens when I turn off iCloud Keychain on a device? When you turn off iCloud Keychain for a device, you're asked to keep or de

From Apple documentation; What happens when I turn off iCloud Keychain on a device? When you turn off iCloud Keychain for a device, you're asked to keep or delete the passwords and credit card information that you saved. If you choose to keep the data, it isn't deleted or updated when you make changes on other devices. And then... When you turn on iCloud Keychain, any previously-saved website usernames and passwords, Wi-Fi networks, and Internet accounts are automatically included in iCloud Keychain. https://support.apple.com/en-us/HT204085 https://support.apple.com/en-us/HT204085