AWS SNS publish only works locally, but not from lambda - node.js

Question

This is the code that runs successfully on local to send sms
const snsParams = {
Message: "Hello World",
PhoneNumber: normalizedPhoneNumber,
};
const sms = messager.publish(snsParams).promise();
sms.then(data => {
console.log('Success!', data);
}).catch(err => {
console.log('Error!', err);
});
However, this does not fire from my deployed lambda.
My serverless.yml contains the necessary iamRoleStatements like this
iamRoleStatements:
- Effect: Allow
Action:
- dynamodb:DescribeTable
- dynamodb:Query
- dynamodb:Scan
- dynamodb:BatchGetItem
- dynamodb:BatchWriteItem
- dynamodb:GetItem
- dynamodb:PutItem
- dynamodb:UpdateItem
- dynamodb:DeleteItem
Resource:
- arn:aws:dynamodb:us-west-1:*:table/${app-name}-${self:custom.stage}
- arn:aws:dynamodb:us-west-1:*:table/${app-name}-${self:custom.stage}/*
- Effect: Allow
Action:
- sns:*
Resource: "*"
I've also checked from the IAM Management console to see that SNS is included in my lambda role
How can I make this work? What am I missing?

Answer 1

I think the problem could be in promises, because the line
messager.publish(snsParams).promise(); creates only a promise and there is no waiting when the promise is executed.
You can change your code so:
exports.handler = async function(event) {
...
const snsParams = {
Message: "Hello World",
PhoneNumber: normalizedPhoneNumber,
};
try {
const sms = await messager.publish(snsParams).promise();
console.log('Success!', sms);
} catch (err) {
console.log('Error!', err);
}
}