The issues reported earlier by Blizzard have now been resolved:
If you are still having problems logging in, please start with these connection troubleshooting steps (click here).
This was posted on the Blizzard Customer Service Twitter feed:
This includes any “Unable to log-in”, “Timeout from communicating” and “No Overwatch License Found” error messages you may see.
Please hang tight everyone!
Additional Updates from Lead Engineer Bill Warnecke:
Most recent…
Yeah I just got that myself.
*trombone WHA WHA…
time to avoid comp for today
Always a wise idea until the all-clear signal is given.
On a side note, this is not just Overwatch but affecting all Blizzard games. If I get more details I will share them appropriately.
Hey folks we’re working on a problem now that’s affecting our North American infrastructure for all titles, apologies for the disruption.
Thanks for the updates as always!
nooooo i got it too 
Changing servers allows you play elsewhere if anyone just wants to play. Might be a bit more laggy depending on your connection though.
That is correct, though I often don’t recommend it as latency does increase to as much as 200 milliseconds.
Thanks for the speedy response. Happy (bug) hunting!
As someone who will sometimes have their internet randomly spike to 200ms, and sometimes as high as 350ms, take this as your warning not to do that. At anything above 150ms I stay out of comp, it’s not worth it.
If I never saw the problem it probably wasn’t even a problem, you nerd.
… that’s one way of putting it.
At this time we’re recovering, hopefully everyone is back online now! Sorry again for the hassle and I hope everyone has a great weekend. Cheers!
Praise the nerd!
It looks like a problem on Blizzard app.
Destiny 2 is also offline.
May be only a coincidence though…
Thanks again… I can now resume eating my burrito and working on my editing of a
Since Destiny 2 goes through the Blizzard Authentication Servers for logins, they too would be affected with this specific issue (expect “BUFFALO” error code messages). If you are still hitting errors, remember to hang tight, and there may be queue lines to log in now present.
is this usa only? cuz here in eu i can play pretty fine
It is, it only affected the North America infrastructure.