Hi Derek,
I’ve shifted your post to Support. I couldn’t see a prior thread with Eric but let’s flag him (@Eric) so he sees this post.
I’d suggest restarting everything, if you haven’t already done so. If that doesn’t work then post some system details as per this thread and Support will investigate further.
If you are using a USB connection to the DAC then it may not appear in Roon when the DAC is set to another input.