AWS::IAM::AccessKey
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Access Keys can be generated per IAM user or root user under Security credentials
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This access key can be used in 
- Management Console: password + MFA
- Command Line Interface: access key id + secret access key or with cloud shell
- Software Development Kit: access key id + secret access key
Properties
Type: AWS::IAM::AccessKey
Properties:
  Serial: Integer
  Status: String
  UserName: String