Amazon Cognito ユーザープールでパスワードポリシーを変更後に既存のパスワードでのログインはできますか?
https://dev.classmethod.jp/articles/tsnote-cognito-can-i-log-in-with-my-existing-password-after-changing-the-password-policy-in-the-amazon-cognito-user-pool/
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