There is the following bug with the region selection:
In a squad game the party host choose EU as server and press the ready button. The teammates also press ready. The game starts. After the round, some people sometimes have NA selected as region, not EU anymore. If now a team member presses ready before the party host (re)selects EU, no game will be found in EU at all. The bottom right corner displays ready, but no game will be found (not even after 10min).
To get out of this situation, a game must be played on NA. It will instantly find a game.
To prevent this behavoir:
The host must click NA and after that click EU. No team member may press ready before EU is selected again!