Update: It's fixed now as of 5:58 PM Central.

So I just got back from work and ready to play Heroes of the Storm. However, I'm stuck at authentication. I tried playing on a different region, Europe, and I was able to log in. I tried using another desktop to log in but it still does not authenticate. I deleted the local cache folder, and still stuck at authentication. Tried different accounts and couldn't log into the Americas.

Checked in with Down Detector and it seems that many users are reporting the same issue today of not being able to log in (March 12, around 5:00 PM Central). It's weird because I'm seeing a couple of friends logged into HoTS and WoW. But they're probably logged into a different region. Let's see what happens.