Can't log into Liuyun account

I am in the United States. I can't log in with the Liuyun account I just registered. I clicked the "log in," and there was no response. And there are no notifications when I type the wrong password. I've chosen the "北美数据中心" server.

I can log in with my Siyuan account when I choose the "链滴" server. And I got a notification of "wrong password" when I typed the wrong password.