Sonos Play 5 Speakers were working perfectly as an end point Zone. I changed the default gateway of the WiFi and the range of the DHCP addresses. Everything else is working perfectly. Upon trying to play the Sonos on Roon. I received the above message. Realizing that the Sonos WiFi setup had changed, I went through the process of resetting all speakers to factory default, I reset the Sonos controller app to allow me to start from scratch configuring a new Sonos system. I went through the entire process, including retuning the room. When configuration was complete, I tried again multiple times to play Roon and got the same message as above .
You may disregard. I just rebooted the Core and it is working. Sorry for not thinking of that earlier.
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