Lambda does not add data to mongodb EC2

I have an API running on aws lambda and api gateway. On the local host and the test database (mlab) everything works fine. But when deploying to Amazon my API cannot add data to mongodb which is on ec2. We have all the permissions open and lambda and mongodb are on the same vpc.

Here is my code:

MongoClient.connect(dbURL, {useNewUrlParser: true }, function (err, db){ if (err) { console.log('Unable to connect to the mongoDB server. Error: ', err); } else { console.log('Connection established to ', dbURL); } let myDB = db.db('iyc') let arr = []; locations.forEach(element => { let insertData = {}; insertData.user_id = req.body.user_id; insertData.device_id = req.body.device_id; insertData.app_type = req.body.app_type; insertData.datetime = JSON.parse(element.datetime)/1000; insertData.latitude = element.latitude; insertData.longitude = element.longitude; insertData.address = element.address; insertData.method = element.method; insertData.accuracy = element.accuracy; insertData.status = element.status; insertData.confidence = element.confidence arr.push(insertData) }) try { myDB.collection('userdevices').insertMany(arr, function(err, data) { if(err) { console.log("Insert db err " + err) } else if(!data) { console.log('No data has been inserted') } }) } catch(err) { console.log(err) } db.close(); })