If you can't log into Google or Youtube because you get the message "couldn’t sign in because browser or app is not secure," check out this thread in which you'll learn this trick:
Go to Plex.tv and use the Google login.
It doesn't actually have to match an account on plex.
You can then close the browser and YouTube will have you logged-in.
It doesn't actually have to match an account on plex.
You can then close the browser and YouTube will have you logged-in.