I've been trying to use the HBO Go app on the web (Chrome Browser), on my Roku, and on my iOS mobile device. And on all these platforms, I get an error saying "Something went wrong!" I'm able to watch HBO within the DTVNow app itself, but I can't seem to get use these same creds to work within the HBO Go application.
OK, I found the solution to this issue. I changed my DTVNow password to no longer have any special characters (just letters and numbers), and that fixed it. Should have searched harder initially for the solution.