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You are probably using the Bucket address, not the Static website. In Bucket, if Voce makes a get request without specifying the key, it understands it as a listing, which should not be allowed. When creating the Static website you can specify the index file (index.html) and get a different address (http://examplebucket.s3-website-us-west-2.amazonaws.com), either responds in the desired manner.
More details in the documentation on https://docs.aws.amazon.com/pt_br/AmazonS3/latest/dev/WebsiteHosting.html
I left to say I’m using Cloudfront + S3 (I did a test on another Bucket without Cloudfront and gave the same error). I found a solution through the Lambda. I have not posted yet because it is very extensive.
– Mr Genesis