Hey there.
This is a community forum – please don’t bump threads (and certainly not less than a day later).
If you are using TeamCity, keeping in mind they do have a homegrown SonarQube integration that may work for SonarCloud (I haven’t tested it though), you will need to pass the sonar.pullrequest.* parameters whenever a Pull Request is being raised (using environment variables that are available in your build environment). Those sonar.pullrequest.* parameters are define here
You’ll find similar advice for another CI (buildkite) here: