You can trust devices from your smartphone via push notification using the TeamViewer Remote Control app. For general information about how to add trusted devices to your account, please read this article: Sign in with your account
1) Log in to your TeamViewer account via the TeamViewer client or the Management Console.
2) After clicking Sign In, the following pop-up appears:
3) Tap the notification at the top of your screen saying Sign-in request.
Hints:
4) The device's information will appear. Select between:
5) Tap Trust. Your device has now been added as a trusted device.
Note: You can ignore the trusted device request you have received via e-mail, as you have confirmed it via the TeamViewer Remote Control app.