No good. Not supported

So AT&T owns DirecTV which owns HBO, but this app is not supported on I phone 6+ and won’t allow me to sign in. And I have AT&T and DirecTV now streaming through a Apple TV which works flawlessly by the way. I have all of their services and I can’t even sign into an app that they own. Major glitch in the system not impressed.

Lucky (Phoenix,AZ) about HBO GO: Stream with TV Package, v13.0.0