Yes. I think you must be right.
When I connect the Pi to a different dac, it connects to Roon as an endpoint. I can see the Pi in a browser whether it runs Ropiee, Volumio or Moode. But it is just not making the circuit (so to speak) with the S100.
PS Audio has indicated that they will have someone look into the issue for me next week, so I will just sit tight and wait. This is my office set up, and I won’t be going to the office until Monday anyway.
Thanks