A Developer has created a new AWS IAM user that has s3 putObject permission to write to a specific Amazon S3 bucket. This S3 bucket uses server-side encryption with AWS KMS managed (SSE-KMS) as the default encryption. Using the access key and secret key of the IAM user, the application received an access denied error when calling the PutObject API. How can this issue be resolved?

Questions on how to write code and design scalable applications, implement application security and testing, and on AWS components such as S3, Dynamo DB, Elastic Beanstalk, and CloudFormation.