I have the same problem as you, when I turn on the notification, it shows an error "operation failed". I use many different types of Reolink cameras, tried many ways such as deleting the app, reinstalling, resetting the device... but it still doesn't work. I heard that many people have had this problem recently, it must be a common error from the app or the system. I'm waiting for an update or official response from Reolink solar smash.