Smart Notifications are not working in SonarLint VSCODE Connected Mode

Hello together

I have configured my SonarLint VSCODE plugin with ConnectedMode. I am using the Developer Edition 7.7 and should get Smart Notifications as soon as the QualityGate fails. Unfortunately I don’t get Smart Notifications.

Does the VSCODE SonarLint plugin have this functionality at all, or is it possible that our firewall intercepts these notifications somewhere and does not let them through?

Regards
Alfred