We got email “SonarCloud upcoming change: “sonar.organization” property soon mandatory”
We request to change “sonar.organization”
But it is already changed to be “checkstyle” few years ago.
Here is where it defined https://github.com/checkstyle/sonar-checkstyle/blob/master/travis.sh#L18
Please let me know if you still see checkstyle plugin in some other organization.