I’m wondering maybe because you and your friends are outside Japan. I remember this game (and most of the games I know) basically says they allow players login from inside Japan, and do not support logging in from outside Japan... are you outside Japan?

some how i found the way to temporarily fix it, change the system timezone to Japan and now I can active the button. The problem must is we live outside Japan.

Very nice solution! That makes sense, as the system may have confused of the time zone difference versus automatic login system. Cheers