"[USER] is not authorized to perform: s3:ListAllMyBuckets on resource: arn:aws:s3:::"
Now, select the newly created account in the drop down list. If you look at the list of buckets it will be empty. This is because we have not granted the user a right to list all buckets. You have to add a bucket as an external bucket manually. Click a green button on the tool bar and type the bucket name manually.