このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
unable to verify secret hash for client
対処
関連リンク
AWS Cognito User Pools のサインアップ時に NotAuthorizedException ...
https://qiita.com/noobar/items/6615501b035e47792227
Unable to verify secret hash for client in Amazon Cognito ...
https://stackoverflow.com/questions/37438879/unable-to-verify-secret-hash-for-client-in-amazon-cogni・・・
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https://stackoverflow.com/questions/52487433/amplify-unable-to-verify-secret-hash-for-client
Unable to switch User Pools on AWS Mobile Hub
https://stackoverflow.com/questions/49418506/unable-to-switch-user-pools-on-aws-mobile-hub
AWS Forgot password: Unable to verify secret hash for client ...
https://stackoverflow.com/questions/47426017/aws-forgot-password-unable-to-verify-secret-hash-for-cl・・・
AWS Cognito Unable to verify secret hash for client
https://stackoverflow.com/questions/43659441/aws-cognito-unable-to-verify-secret-hash-for-client
Amazon Cognito User Pool / Identity Poolで事始め ? サーバーワークス ...
http://blog.serverworks.co.jp/tech/2018/08/16/amazoncognitosample/
Unable to verify secret hash for client ・ Issue #125 ・ awslabs/aws ...
https://github.com/awslabs/aws-cognito-angular-quickstart/issues/125
Unable to verify secret hash for client cognito ・ Issue #3 ・ aws-samples ...
https://github.com/aws-samples/aws-cognito-java-desktop-app/issues/3
Cognito: Unable to verify secret hash for client ・ Issue #484 ・ aws ...
https://github.com/aws-amplify/aws-sdk-android/issues/484