Cloud Sync Not Working

1. Confirm that same Apple ID is used on both the devices.

• For macOS, System Preferences > Apple ID

 

• For iOS, Settings > Account 

      2. Check that the iCloud > Keychain is enabled in iCloud settings.

• For macOS, Go to  System Preferences > Apple ID > iCloud > enable Keychain.

• For iOS, Go to Settings > Apple ID > iCloud > Toggle ON Keychain.