This morning I kept getting a new error on the Windows app from Steam:
"Error server is blocked due to a long running script"

This afternoon, I can't even search for a game. I can't get past "Auto match" and "Custom match". I click on the button and the screen flashes and sometimes I can see the next screen before I'm back to the same spot.

21 Jan 2020 Unable to play.
23 Jan 2020 Still unable to play.