...I've been able to get the mic to work with Oculus link using a USB headphone and mic. Here's what I did: 1. Opened Sound Settings. 2. clicked on Manage sound devices. 3. Disabled Headset Microphone "Oculus Virtual Audio Device". 4. Make sure that you choose the USB mic that you have plugged in for both "Output" and "Input". Using this technique I'm able to get the mic to work in Altspace using the Oculus Link.
Is your usb mic still working? I cannot get my usb mic to work while using the rift. I'm using the Deluxe Audio Strap for my headphones for the comfort and i'm trying to use my usb plug in studio mic but it's not working. It was working fine before the last update and now after the update it's no longer working.