I’ve had this problem in the past, where I could not log onto my main Heroes account for a week or so because of constant authentication errors. For some reason, changing my email fixed that.
So the problem arised again, but only in my accounts that were higher up in rank (no bans were issued). Anyway, I went back from college, where I cannot connect, back to my home town. Instantly, when I got back home and tried logging in, my main account worked! Then, when I tried at college once I got back, I got the authentication error again.
I want to point out that my non-ranked accounts are completely able to log in without any errors. I’d appreciate any help!
P.S for those that want to yell at me for having smurfs, I do it to play with friends who are not nearly good enough to enjoy a game at my main’s MMR.