$ export INSTANCE="i-01234567890abcdef"
$ aws ec2 describe-instances --instance-ids ${INSTANCE}
An error occurred (UnauthorizedOperation) when calling the DescribeInstances operation: You are not authorized to perform this operation. User: arn:aws:iam::111111111111:user/test-niikawa is not authorized to perform: ec2:DescribeInstances because no identity-based policy allows the ec2:DescribeInstances action