Pipeline Task failed because it would exceed LoC limit

After excluding the .xml files in the pipeline prepare task, it worked. In our setup the SonarQube UI for the webbrowser seems to have no effect at all.

#Your build pipeline references an undefined variable named ‘Parameters.projectKey’. Create or edit the build pipeline for this YAML file, define the variable on the Variables tab. See YAML schema reference | Microsoft Learn

#Your build pipeline references an undefined variable named ‘Parameters.projectKey’. Create or edit the build pipeline for this YAML file, define the variable on the Variables tab. See https://go.microsoft.com/fwlink/?linkid=865972

steps:
- task: sonarsource.sonarqube.15B84CA1-B62F-4A2A-A403-89B77A063157.SonarQubePrepare@6
  displayName: 'Prepare analysis on SonarQube'
  inputs:
    SonarQube: Sonar
    projectKey: '$(Parameters.projectKey)'
    projectName: 'Quality Check'
    extraProperties: |
     # Additional properties that will be passed to the scanner, 
     # Put one key=value per line, example:
     sonar.exclusions=**/*.bin,**/*.xml,**/*.xsd
     sonar.vbnet.vscoveragexml.reportsPaths=**/*.coveragexml
     sonar.verbose=true

Thanks Denis!