cloudda S3存储桶访问被拒绝

在我的CloudFormation模板中,我有一个lambda,其代码位于S3上:

MyLambda:
  Properties:
    Code:
      S3Bucket: bucket-name
      S3Key: filename.zip
  Handler: handler
  MemorySize: !Ref 'LambdaMemorySize'
  Role: arn:aws:iam::XXXXXXXXXXX:role/my-role
  Runtime: python3.6
  Timeout: !Ref 'LambdaTimeout'
Type: AWS::Lambda::Function

如果我从AWS控制台运行它,那么它可以正常工作。但是,当我从AWS CLI(或boto)运行此命令时,它就不起作用了,因此我想我的用户凭据中一定缺少了阻止此操作的内容。但是,我的IAM用户具有管理员访问权限:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "*",
            "Resource": "*"
        }
    ]
}

错误消息:

Your access has been denied by S3, please make sure your request credentials have permission to GetObject for bucket-name/filename.zip. 
S3 Error Code: AccessDenied. S3 Error Message: Access Denied (Service: AWSLambda; Status Code: 403; Error Code: AccessDeniedException; Request ID: xxxxx)