Greenlock-Express doesn't work with le-store-s3

[koder217]

I was able to get greenlock-express working with default filesystem middleware. But i will need S3 in production. I tried using le-challenge-s3 and le-store-s3. But i can't even open the site. ("Site can't be reached" in chrome). I am debugging from VPS exposed to internet and confirming DNS entries work fine. (It worked with "fs" middleware)

I set debug to true and the following is printed and nothing else happens (domain name changed to example.com)

[le/index.js] le.approveDomains called with certs for NONE and options:
[le/index.js] { domain: 'example.com',
 domains: [ 'example.com' ],
 agreeTos: true,
 email: '[email protected]' }
[le/index.js] le getting from disk or registering new
[le/lib/core.js] checkAsync failed to find certificates

Following is my initialization code:

const S3 = {
    bucketName: 'example-letsencrypt',
    region: 'us-west-2'
};
const store = require('le-store-s3').create({S3});
const challenge = require('le-challenge-s3').create({S3});
var lex = require('greenlock-express').create({
                server: 'https://acme-staging-v02.api.letsencrypt.org/directory'
                , version: 'draft-11' // Let's Encrypt v2 (ACME v2)
                , challenges: {'http-01': challenge}
                , challengeType: 'http-01'
                , store: store
                , approveDomains: approveDomains,
                configDir: "acme",
                app: app,
                debug: true
            });
            lex.listen(80, 443);

function approveDomains(opts, certs, cb) {
    if (certs) {

        opts.domains = certs.altnames;
        cb(null, {options: opts, certs: certs});

    } else {
        opts.email = "[email protected]";

        opts.agreeTos = true;

        cb(null, {options: opts, certs: certs});
    }
}

I don't know what I am doing wrong. I don't see anything in example-letsencrypt bucket in S3.