fails to create issue

I have this simple DSL pipeline
```
pipeline {
agent any
stages {
stage('Example') {
steps {
script{
echo 'Hello World'
properties([[$class: 'GithubProjectProperty',
projectUrlStr: 'https://github.com/ramprasadgk/java-maven.git']])
}
}
}
}
post {
always {
echo 'I will always say Hello again!'

step([$class: 'GitHubIssueNotifier',
issueAppend: true, issueTitle: 'test'])
}
}
}

```
pipeline runs without any issue however no issues are created
am i missing something?