Help - Lost Audio Output

I lost my audio output in Nuendo. I am using a Grace Design M920. I went through all steps including trying to reconnect VSTs. No luck. When I load an older project, I get a warning that I am missing ports:

Speakers (2-XMOS USB Audio) Unmapped

But when I go to devices and try to select XMOS USB Audio 2.0 ST 300D, I get a “No device is connected”.

I’m on a PC.

Please note that I am relatively new to all of this audio stuff.

Any advice would be greatly appreciated. Thanks.

Yes, just came across this recently. Cubase 10/10.5 does not work with Grace Designs equipment - apparently the ASIO driver cannot recognize it