BLZBNTBGS80000011 tried almost everything.
uninstalling. reinstalling.
delete folders. disabling firewalls and anti virus ( windows)
deleting app data.
running in admin.
using VPN.
resetting router.
beta.
disabling authenticator.
changing password.
using google to sign in.
releasing, renew and flushing dns.
I’m having same issue. Forget it dude, I bought new laptop from Best buy and have the exact same issue.
It’s a blizzard issue not a issue on our end. Or perhaps ISP. Are you located in Canada by chance?
I’m still having those same issues.
Me too, tried absolutely everything and nothing works. 
Still same issue for me too
Where are you guys from if you dont mind me asking? I am from Iceland. Just wondering if this is a EU thing over a US thing…
I am from Canada… still doesn’t work on both my MacBook or my windows notebook…
Similar problem. Solution are not found.
And this solution does not help:
I tried logging in today and it worked. Whatever they did on their end, they fixed it.
It’s still not working for me. It’s been over a week.
still not working for me too
I found a direct number to Blizzard’s tech support and they helped figure out my problem (my anti-virus). I deleted it and now my login works. You may need a different solution, so I’d advice calling them directly using this number: 1-800-592-5499. You’ll get an actual person to talk you through solutions.