Integrating IoT device with smartthings

Hi, Im trying to integrate an Iot device(cloud connected) with smartthings. The things i have done far is 1.developer account
2.aws lambda
3.linked lambda arn with smartapp
But when i open the app and click on the smartapp i created, it is showing setup not complete.

what should i do

@namithathomas
Could you confirm if this integration is intended to be published commercially? If so, it would be better to use the Schema Connector for enhanced security and reliability.