Is the screenshot from the Mac you use for your Core, or is this Mac used as a Roon Remote? What version of Roon are you using? Can a phone Remote see your Core via WiFi?
I am assuming you are using the Taiko extreme as the core.
The first things I’d check is to see if your Wifi and ethernet networks are now two different subnets. Compare the IP numbers of the MacAir and the Taiko Extreme. Post them if you are unsure, but, the first three number groups need to be the same. aka 192.168.1.x where X should be unique.
Thanks for reaching out. Are you still seeing the issue at the present time? It doesn’t look like your Taiko server is online at the moment, I am not sure if there is an issue with the server itself, but if so, you may want to reach out directly to Taiko support - contact@taikoaudio.com