Most Camera and Mic issues on the desktop app for Mac are because Here doesn't have permission to access your hardware. Follow the steps below to fix:
For Camera:
1. Go to System Preferences → Security and Privacy → Camera → enable Here to access the camera device
- Note: You may have to unlock the security lock in the bottom-left corner of the settings
2. Quit and restart the Here Desktop App after enabling camera access
For Microphone:
1. Go to System Preferences → Security and Privacy → Microphone → enable Here to access the microphone device
- Note: You may have to unlock the security lock in the bottom-left corner of the settings
2. Quit and restart the Here Desktop App after enabling microphone access