Hi Zoe,
Sorry to hear you are having troubles with the headset.
If you haven't already got it I would suggest downloading the Jabra direct software.
https://www.jabra.com/en-au/software-and-services/jabra-direct
This just runs in the background but provides full integration between the headset and Zoom software.
If you already have this and are still having troubles please give our team a call on 1300 082 505 to discuss.