SonarLint connected mode is not working in VS code

I have Sonar Lint version as 1.15.0 and Vs Code version as 1.43.I have given the server setting as

"sonarlint.connectedMode.connections.sonarqube": [ { "serverUrl":"xx",//Server url "token": "xx"//Token generated from SonarQube } ],

This configuration is given in the user setting of Vscode. In the work space setting.json have given the following code,

sonarlint.connectedMode.project": { "connectionId": "mySonar", "projectKey": "my-dream-app" }

The problem is Sonar Lint is not getting connected with the Sonarqube server.Could any one help me out why this configuration is not working .