When updating a user profile including protected attributes, it is necessary to provide a password as a header attribute as a currentpassword header. HTTP Headers only support ISO-8859-1, meaning that if the password is "パスワード" it will fail.
At the moment XUI fails to send the request as it is unable to up the password in, instead showing the error message "Unknown error. Please contact your Administrator".
Even if the requeset is sent the header with UTF-8 characters, for example
the request fails with the debug message
in the OpenAM CoreSystem debug logs.