Understand your frustration and there is definitely something related to the integration of HBOGO and Fios that makes the authentication process get stuck. I made one small addition to the steps that I posted earlier. Please check if this slightly modified version of the above process works. I was able to get this working on Samsung S8 and Samsung Tablet.
Go to Android application manager and Force Stop the HBOGO application followed by Clear Cache and Clear Data (I did not re-install the app)
- Open Chrome - Go to settings -> privacy -> clear browsing data for "all time"
- Then, make sure you close all Chrome browser tabs. Chrome should not be running and completely shutdown before you go to next step
- Then immediately openened the HBOGO app and try to Sign In. It should go past the fios authentication