HBO GO sign in not working with FIOS

[willoshields]

The solution is to clear the cache and memory in the APP.

Go to SETTINGS

Select APPS

Find the app in question... HBOGO, NBCSN, etc (anything that requires service authentication from Verizon)

Select MEMORY

Select "Clear Memory" and "Clear Cache"

Close out of Settings

Re-open the App (HBOGO, NBCSN, etc.) and start anew

[Tarkus1]

For me it it seemed the key was: Clear cache BEFORE clearing data.

(Clearing data FIRST did not fix the problem, rather clear cache FIRST)