A problem occurred. When entering the username, it returned "Could not log you in now. Please try again later"

[ziher-2]

A problem occurred. When entering the username, it returned "Could not log you in now. Please try again later"

[tsukumijima]

I'm not sure what the cause is, but I have confirmed that this error is now always occurring on my side. However, at least until a few days ago when v1.6.0 was released, I was able to log in without any problems using this code.
It may be that without "castle_token" it is no longer possible to pass LoginEnterUserIdentifierSSO.
Any help would be greatly appreciated.

[gugugudo]

I have successfully reverse engineered castle_token.