Steven - appreciate the instructions, but this is irrelevant to the issue we're facing.
The replacement USB Link is recognized by our PC (it shows up as an audio device in Device Manager; also, I can change the sound settings to output to the USB Link). The Surface app (downloaded from here) does not recognize the presence of the replacement USB Link, therefore we cannot follow the instructions to connect our Surface Headphones 2+ to the USB Link: https://prod.support.services.microsoft.com/en-us/surface/get-a-replacement-for-microsoft-surface-usb-link-e862e6c6-0945-494f-bb4d-2e731f3b4724
Specifically, step "3. In the Surface app, select your Surface Headphones, then select Microsoft Surface USB Link > Pair.". There is no option to select Microsoft Surface USB Link, so we cannot use the replacement USB Link.
This needs to be fixed ASAP - the main advantage (and premium price increase) of the Surface Headphones 2+ is the usage of the USB Link for native Teams support.