Unable to create AWS Quicksight embedded dashboard URL

Scenario

1. I have a serverless react js app hosted in S3.
2. I am using Cognito for user authentication.
3. Configured the Cognito identity authenticated role with the quicksight:CreateUser permission.
4. I loaded data into Quicksight from data files in S3 and created a dashboard.

I am using the below code to create an embedded dashboard URL from my node js (v8.10) lambda function.

const AWS = require('aws-sdk');
var quicksight = new AWS.QuickSight({
    region: 'us-east-1'
});
return quicksight.getDashboardEmbedUrl({
                'AwsAccountId': 'XXXXX',
                'DashboardId': 'YYYYYYY',
                'IdentityType': 'IAM',
                'ResetDisabled': true,
                'SessionLifetimeInMinutes': 100,
                'UndoRedoDisabled': false
            }).promise().then((res) => {
                console.log('Response: ');
                console.log(res);
            }).catch((err) => {
                console.log('Error: ');
                console.log(err);
            })

**

I am getting the below error.

**

2019-01-15T17:48:42.496Z    cafaa35a-18ed-11e9-9e84-ad156518dcbe    { UnknownError: Forbidden
at Object.extractError (/var/task/node_modules/aws-sdk/lib/protocol/json.js:51:27)
at Request.extractError (/var/task/node_modules/aws-sdk/lib/protocol/rest_json.js:52:8)
at Request.callListeners (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:106:20)
at Request.emit (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:78:10)
at Request.emit (/var/task/node_modules/aws-sdk/lib/request.js:683:14)
at Request.transition (/var/task/node_modules/aws-sdk/lib/request.js:22:10)
at AcceptorStateMachine.runTo (/var/task/node_modules/aws-sdk/lib/state_machine.js:14:12)
at /var/task/node_modules/aws-sdk/lib/state_machine.js:26:10
at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:38:9)
at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:685:12)
message: 'Forbidden',
code: 'UnknownError',
statusCode: 403,
time: 2019-01-15T17:48:42.440Z,
requestId: 'XXXX',
retryable: false,
retryDelay: 1.6256019461018845 }


2019-01-15T17:48:42.938Z    cafaa35a-18ed-11e9-9e84-ad156518dcbe    Error: 
2019-01-15T17:48:42.938Z    cafaa35a-18ed-11e9-9e84-ad156518dcbe    { QuickSightUserNotFoundException: Could not find user information in QuickSight
at Object.extractError (/var/task/node_modules/aws-sdk/lib/protocol/json.js:51:27)
at Request.extractError (/var/task/node_modules/aws-sdk/lib/protocol/rest_json.js:52:8)
at Request.callListeners (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:106:20)
at Request.emit (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:78:10)
at Request.emit (/var/task/node_modules/aws-sdk/lib/request.js:683:14)
at Request.transition (/var/task/node_modules/aws-sdk/lib/request.js:22:10)
at AcceptorStateMachine.runTo (/var/task/node_modules/aws-sdk/lib/state_machine.js:14:12)
at /var/task/node_modules/aws-sdk/lib/state_machine.js:26:10
at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:38:9)
at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:685:12)
message: 'Could not find user information in QuickSight',
code: 'QuickSightUserNotFoundException',
time: 2019-01-15T17:48:42.938Z,
requestId: 'XXXXX,
statusCode: 412,
retryable: false,
retryDelay: 84.05706341238961 }

Any idea why this is coming ? Do i have to add the user in the quicksight portal as well ? I thought quick sight-cognito integration is plug and play.

Thanks in advance for help.