Adding comment from Jenkinsfile during building Merge Request in Gitlab does not work.

Jenkins job is created using Gitlab Branch Source plugin. The job type is Gitlab Group.

When

addGitLabMRComment

step is run gitlab MR comment is not added as expected and there is no error in build log.

Sample Jenkinsfile to replicate this problem:

pipeline {
  agent any
  stages {
    stage('Build') {
      steps {
        addGitLabMRComment comment: 'Test comment'
      }
    }
  }
}