Diagnostics ********
I have done the complete flow for adding this lamp multiple times, ending with it connected to Ethernet and typing the PIN code from the bottom of the device. It consistently fails to add. It looks like I have the same problem with a symfonisk picture frame but I haven't tried everything with that yet.
The rest of my system, including two other symfonisk products and 3 mainline sonos devices seems to be working fine.
I'm hoping sonos support can see this and do or suggest something.
Moderator edit: diagnostics recorded and removed as identifying information