It seems like Steam is having issue, at the moment, if you can’t login or are stuck in a loading screen, don’t panic, I’m sure eveything will be back to normal soon!
If you’re having issue, don’t hesitate to comment here too.
Valve pushed a beta client update this morning that among other things fixed a login issue:
Fixed a rare bug that could cause the login page to continuously fail with “error 11” until the client was restarted.
So based on that maybe try restarting the client if you’re already having trouble. Could be completely unrelated issue though.
Yep, seeing that with my deck and HoloISO desktop right now. Best advice is probably to avoid restarting, and potentially switch to offline mode if you’re still logged in.