I have UniFi and could not solve it directly either.. But you can manually set up your sonos speakers in Hubitat without using the Sonos connect app with just a little extra work..
Here's how...
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Make sure your Sonos speakers have DHCP reservations so the IP addresses do not change.
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Make a note of all of the IP addresses for your Sonos speakers.
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Go to this website and use the IP to HEX converter to convert each of the IP's into a hexadecimal format.
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Back on your Hubitat hub, create a virtual device for each of your Sonos speakers. Use the "Sonos Player" for the driver. Give them a name and paste the HEX IP into the DNI field and click save.
That's it. Your Sonos speakers should now work on your hub!