The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Me too. I'm in South Korea. Since the 2025.9.1 update, I have been unable to play the game. The client gets stuck on “connecting” indefinitely. I have tried all possible solutions, but the issue persists. I hope this problem will be resolved quickly.