There are some common reasons why your Busylight with Cisco Jabber is faulty.

• It's very important that you reboot your computer after installing the Busylight software for Cisco Jabber, so that the Busylight plug-in get loaded on start-up.
• Make sure to close all other Busylight software than the Cisco Jabber software.
• If you're running another App that uses the IM-interface for Windows, like Teams, you're going to have to change the Registry Entry for 'DefaultIMApp'. (Should be Teams as default)
• Make sure that you've enabled client interface from the Cisco Jabber server side. Click here for a guide on how to do so.