Unknown audio device

We’d like to use different audio devices on a certain user’s PC so that, when a call comes in, the ringtone comes through her speakers but the conversation comes through her headset.

 

On my PC, I can choose from whichever audio devices are connected.

 

On other users’ PCs, however, the audio device is listed as ‘Unknown Audio Device 1’ and can’t be changed:

 

This appears to only affect Trengo. I’ve checked on Google Meet, and I can choose whichever audio devices are connected- in the same browser. So, in one tab I have Google Meet and can change audio device; in another tab I have Trengo and am unable to change the audio device.

 

I’ve tried increasing the user's Trengo permissions to Supervisor, the same as me, but this doesn’t appear to make any difference.

 

If anyone has experienced this and can share a solution, that would be great!

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