First of all, are you trying to use connected mode with SonarCloud or with a SonarQube server?
If you are connecting to SonarCloud, you don’t need to provide a serverUrl and the organization key is visible on your organization’s page on SonarCloud, e.g the key for the SonarSource organization is sonarsource:
If instead you are trying to connect to a SonarQube server, then you need to provide a serverUrl, which is the root URL for your server - e.g, https://my-sq-server.my-company.tld - and you can ignore the organizationKey parameter.
In both cases, the security token should be generated from your user profile on the server, e.g for SonarCloud: