AWS S3 connector - connection issues

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Experts,         I am trying to use the AWS S3 connector in my app. As a first step I want to connect to the AWS and validate the connection before trying to access the content in S3 bucket. But, I am always seeing connection failed error. Below is the microflow that I defined using some of the actions / calls that AWS S3 connector provides. In the microflow, first I create the AwsConfig object and then use the Change object call wherein I set the access key, secret and identifier fields. Then calling the “IVK_ValidateConnection” microflow which internally calls the “ValidateConnection” java action to validate based on the input parameters, but it always throws an error saying “Connection failed”. Can anyone point me out the issue in the below microflow?    
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