I believe it should say approvalWebsiteUrl = 'http://YOUR-S3BUCKET.s3-website-us-east-1.amazonaws.com' instead of approvalWebsiteUrl = 'http://YOUR-S3BUCKET-web.s3-website-us-east-1.amazonaws.com' in startworkflow.py.
I believe it should say
approvalWebsiteUrl = 'http://YOUR-S3BUCKET.s3-website-us-east-1.amazonaws.com'
instead of
approvalWebsiteUrl = 'http://YOUR-S3BUCKET-web.s3-website-us-east-1.amazonaws.com'
in startworkflow.py.