SonarQube 7.2, VSTS Plugin 4.3.0 stop work with Pull request

Hi, After installing the community versie 7.3 of SonarQube I got the same (following) problem with branches in TFS MSBuild integration (Note: I am not using GIT):

“Validation of project reactor failed: o To use the property “sonar.branch.name”, the branch plugin is required but not installed.”

Now I am a little bit lost in the information. Is there a way to solve this problem, or do I have to go back to versie 6.7.5?

Hope someone can help me?