Cant login Error [ {"httpStatus":500,"errorCode":"server_error"} ]

I am Having trouble login in my client i cant open my setting in profile cant login every time its says username and password incorrect can some help me plz and my account is not hacked and it under my control region EU west

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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