AWS-SNS publish() method not sending any messages to phone number - node.js

Question

I have used aws-sdk in node express to send the verification code to the phone number I referred this docs to implement it. here I get the response but do not get any messages on the phone.
const AWS = require("aws-sdk");
AWS.config.update({
region: "region",
accessKeyId: "ACCESS_KEY",
secretAccessKey: "SECRET_KEY",
});
router.post("/", async (req, res) => {
let phone_no = "[phone]****";
let random = Math.floor(100000 + Math.random() * 900000);
const YOUR_MESSAGE = `Your verification code is ${random}`;
let params = {
Message: YOUR_MESSAGE,
PhoneNumber: phone_no,
MessageAttributes: {
"AWS.SNS.SMS.SMSType": {
DataType: "String",
StringValue: "Transactional",
},
};
let publishTextPromise = new AWS.SNS({ apiVersion: "2010-03-31" })
.publish(params)
.promise();
publishTextPromise
.then(function (data) {
return res.json({ id: data.MessageId, otp: random });
})
.catch(function (err) {
return res.send(err.stack);
});
});
is anything I'm doing wrong, new to this aws-sns concept.
here i logged the publishTextPromise i get response as Promise { <pending> }

Answer 1

If you get Success result from api but message is not received. You need to check SNS logs.
On SNS console, you can see Text messaging (SMS) under Mobile section. If you don't enable status logging, firstly edit preferences on Delivery status logs section then on new page create an IAM Role (SNSSuccessFeedback) with Success sample rate 100%.
You can find error on cloudwatch.
Potential problem. You account is in the SMS sandbox in the region which you used.
If you see any message like ☝️, You can add your phone number on sandbox destination phone number.
Then sandbox will send you a verify code, when you put it on AWS console. Then you will be able to receive messages from SNS.