The SonarQube / SonarCloud report does not appear in my Bitbucket repository
If the SonarQube / Sonarcloud report does not appear, it is because that repository does not have the plugin configured to display information. See: Configuration
Why does the report display the branch does not exist?
SonarQube / SonarCloud when after a while a branch has stopped being analyzed, it removes it from your report, so even if you have the branch in your code repository, surely in SonarQube / SonarCloud it no longer exists.