Hi Gregy6,
Welcome to Microsoft Community.
I'm Hahn and I'm here to help you with your concern.
It sounds like you're having trouble getting audio to work through the USB-C port on your Surface Duo, whether you're using a USB-C to 3.5mm dongle or USB-C wired headphones. Here are some steps you can try to resolve the issue:
- Restart the Device: Restart your Surface Duo to see if that resolves the issue. Sometimes a simple reboot can fix hardware detection problems.
- Test with Other Apps: Try playing audio through different apps (e.g., YouTube, Spotify, etc.) to see if the issue is consistent across all apps.
- Clear Cache (for specific apps): If the issue is happening with specific apps, try clearing the app cache. Go to Settings > Apps & notifications > See all apps > [Select the app] > Storage & cache > Clear cache.
- As a last resort, consider resetting your Surface device to see if that resolves any software conflicts causing the issue. Reset Surface Duo to factory settings - Microsoft Support
If none of these steps resolve the issue, there might be a hardware problem with the USB-C port or the
accessories you're using.
Your Sincerely
Hahn. W - MSFT | Microsoft Community Support Specialist