Hello, I've been having trouble with signing in to Join on my Shield TV. I've enabled it in the accessibility settings, but I can't sign in. I can click the sign in button, it asks me to choose an account, then I accept its permissions, and it flashes "getting token" on the screen. It goes back to the "connect your devices" screen and hangs until I press the back button, and pops up an error "couldn't sign in, do you have a valid network connection", which I do. I uninstalled/reinstalled, and rebooted the Shield and I can't get it to work. What have I missed? Thanks!