I installed the latest version of sharkRF link app for MAC OS. The app works and I'm using a DECT Headset. I can hear the stations but the mic doesn't work. I checked all setups and I couldn't find the root cause. Then I tried to start the application directly from the App package "sharkRF link- contents - MacOS - sharkrf-link-app". Now the mic works.
Let me know if you need screenshot because I'm not sure if you understand my explenation how I start the app under MacOS ;-)