would like some input on this as well. I've removed the stock sms app and made Google's sms app the default one. the only problem is these pop-ups get in the way when I send and receive messages, but it does work. Enabling the Disable Permission Monitoring setting in the developer options will get rid of the pop up when you send text messages but the Hint pop up will still be there when you receive messages. Others have said to sign in to Oppo ID to fix this but I am signed in and it still happens.