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)：
s3 invalid ipv6 url
対処
関連リンク
Invalid IPv6 URL while running commands using AWS CLI - Stack Overflow
https://stackoverflow.com/questions/45999285/invalid-ipv6-url-while-running-commands-using-aws-cli
Invalid endpoint on aws s3 ls
https://stackoverflow.com/questions/49353132/invalid-endpoint-on-aws-s3-ls
aws ec2 us-east-2 is an invalid region choice
https://stackoverflow.com/questions/40479737/aws-ec2-us-east-2-is-an-invalid-region-choice
AWS CLI get download S3 URL for private bucket from ...
https://stackoverflow.com/questions/21392796/aws-cli-get-download-s3-url-for-private-bucket-from-aws・・・
How to fix AWS Cli issue?
https://stackoverflow.com/questions/35645265/how-to-fix-aws-cli-issue
IPv6 を使用して Amazon S3 に対するリクエストを実行 - Amazon Simple ...
https://docs.aws.amazon.com/ja_jp/AmazonS3/latest/dev/ipv6-access.html
Making Requests to Amazon S3 over IPv6 - AWS Documentation
https://docs.aws.amazon.com/AmazonS3/latest/dev/ipv6-access.html
AWS Developer Forums: Elastic Beanstalk IPv6 with loadbalancer ...
https://forums.aws.amazon.com/message.jspa?messageID=800192
Amazon S3 のトラブルシューティング - Amazon Simple Storage Service
https://docs.aws.amazon.com/ja_jp/AmazonS3/latest/dev/troubleshooting.html
バケットポリシーの例 - Amazon Simple Storage Service - Amazon.com
https://docs.aws.amazon.com/ja_jp/AmazonS3/latest/dev/example-bucket-policies.html