Hi Max,
Indeed, that happens when people identify the camera and mic with potential privacy threats.
When using Hubgets in the browser for the first time, Chrome/Firefox will request permission to access the user's camera and microphone. This permission is needed if the user intends to use voice/video communication in the browser.
To ensure that microphone and camera are functioning properly for a call, you can try a test call using the Hubgets Page link every user has in the Hubgets Profile - > Hubgets Page.