Passing custom senderID and templateID for AWS SNS in India using NodeJS

So, I am trying to figure out the NodeJS Code for sending SMS to Indian mobile numbers using AWS SNS. I have gotten the code down to sending the SMS but I am not able to map the senderID or the templateID which I have gotten registered. The DLT Template ID has been registered with Airtel DLT Connect and even the entityID has been registered there. I am getting the SMS but with a random senderID, not the one I am assigning. The code snippet is below:

var AWS = require('aws-sdk');

var config = {
    AWS: {
        accessKeyId: "",
        secretAccessKey: "",
        region: "ap-south-1"
    }
}

AWS.config.update({
    accessKeyId: config.AWS.accessKeyId,
    secretAccessKey: config.AWS.secretAccessKey,
    region: config.AWS.region
});

var params = {
    Message: "Your verification code is 123345. This code is valid for 24 hours.",
    MessageStructure: 'string',
    PhoneNumber: '+91XXXXXXXXXX',
    MessageAttributes: {
        "AWS.SNS.SMS.SenderID": {
            DataType: 'String', StringValue: 'CustomSenderID'
        },
        "AWS.SNS.SMS.SMSType": {
            DataType: 'String', StringValue: 'Transactional'
        },
        "AWS.MM.SMS.EntityID": {
            DataType: 'String', StringValue: 'EntityID'
        },
        "AWS.MM.SMS.TemplateId": {
            DataType: 'String', StringValue: 'TemplateID'
        }
    }
};

var sns = new AWS.SNS();

sns.publish(params, function (err, data) {
    if (err) {
        console.log(err);
    } else {
        console.log(data);
    }
});

So, if I don't pass the EntityID and the templateID, I get the SMS but with a random numeric senderID. When I try to pass it in the example shown above, I get the below error:

ParameterValueInvalid: Message attribute names starting with 'AWS.' or 'Amazon.' are reserved for use by Amazon.
    at Request.extractError (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\protocol\query.js:50:29)
    at Request.callListeners (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\sequential_executor.js:106:20)
    at Request.emit (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\sequential_executor.js:78:10)
    at Request.emit (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\request.js:686:14)
    at Request.transition (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\request.js:22:10)
    at AcceptorStateMachine.runTo (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\state_machine.js:14:12)
    at D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\state_machine.js:26:10
    at Request.<anonymous> (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\request.js:38:9)
    at Request.<anonymous> (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\request.js:688:12)
    at Request.callListeners (D:\WORK\Agri10x\Development\Projects\dataserver\node_modules\aws-sdk\lib\sequential_executor.js:116:18) {
  code: 'ParameterValueInvalid',
  time: 2022-01-06T09:33:30.590Z,
  requestId: 'dc92b0a1-e561-5ae4-a32d-eaf15ccb3fea',
  statusCode: 400,
  retryable: false,
  retryDelay: 57.53422286102854
}

Any help would be appreciated! Thanks in advance!