They do say "We recommend that you do not use periods (".") in bucket names when using virtual hosted–style buckets." in the "bucket restrictions": https://docs

They do say "We recommend that you do not use periods (".") in bucket names when using virtual hosted–style buckets." in the "bucket restrictions": https://docs.aws.amazon.com/AmazonS3/latest/dev/BucketRestrictions.html https://docs.aws.amazon.com/AmazonS3/latest/dev/BucketRestri... Still, seems kinda lazy from their part, they could just generate a custom cert.