Why can't I synchronize contacts with a specific app in the application, even though there is a landing page for it?

On our landing pages, such as this one for Pipedrive + DATEV, we also provide detailed information about the development status (e.g., "This app is already in development"). This indicates that we are already working on this combination and it will be available in the future. Therefore, an app in this combination (in this case, "DATEV") is not available in the sync.blue® dashboard.