このエラーは、一般的に新規作成された直後の Marketing Cloud(マーケティングクラウド)ユーザーでのログイン (以下、初回ログイン) のときに、「パスワードを忘れましたか?」からパスワードリセットを実行した場合に発生します。
初回ログイン時にパスワード不明となった場合、ユーザー自身でのパスワードリセットを行うことはできないため、同組織内の管理者権限ユーザーでパスワードの変更を行い、対象ユーザーに通知する必要があります。
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