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)：
was not able to validate the provided access credentials
対処
関連リンク
AWSコマンドが突然うごかなくなるケースに遭遇 - Qiita
https://qiita.com/aya_eiya/items/a95724b76a30ed76d279
AWS SDKでAuthFailure【cloudpack 大阪 BLOG】 - cloudfishのブログ
http://cloudfish.hatenablog.com/entry/2017/05/14/233710
awscliはOS内の時間が狂ってるとAuthFailureが出る | ハックノート
https://hacknote.jp/archives/13234/
AWS Developer Forums: Setting up AWS CLI - AWS was not able ...
https://forums.aws.amazon.com/thread.jspa?messageID=722197
AWS was not able to validate the provided access ...
https://forums.aws.amazon.com/thread.jspa?messageID=873844
AWS Developer Forums: AWS was not able to validate ...
https://forums.aws.amazon.com/thread.jspa?messageID=825868
AWS Developer Forums: Windows Cli tools error AuthFailure ...
https://forums.aws.amazon.com/thread.jspa?messageID=706043
AWS was not able to validate the provided access credentials ・ Issue ...
https://github.com/ansible/ansible/issues/25459
AuthFailure => AWS was not able to validate the provided access ...
https://github.com/mitchellh/vagrant-aws/issues/372
AWS SDKでAuthFailure【cloudpack 大阪 BLOG】 | cloudpack.media
https://cloudpack.media/31076