this didn't work for me. I've been having the same issue. this **bleep** app does not even load a sign in page. it gets stuck on 3 dots loading screen forever when I select verizon FIOS (my ISP). this version of the app clearly just doesn't work on some devices or whatever updated version of android people have. far from an isolated few instances.
just to add, SHowtime Anytime, AMC, every other app of this kind works. just an issue withHBO GO. and it's impossible to update the **bleep** app or chose an older version to install. this is a Verizon issue. selecting any other random provider on HBO's list brings up the proper authentification page immediately. Verizon needs to stop passing the blame and fix this.