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Hi
Welcome to the Sonos Community!
My immediate thought is that you might have the Arc’s WiFi disabled if you have it ethernet-wired. The Arc needs it’s WiFi radio to bond the Sub to itself, so please ensure the Arc’s WiFi is enabled: Settings » System » room with Arc] » Arc » Enable WiFi.
If that wasn’t the issue, please try rebooting the Arc by removing power for a time.
Failing that, I recommend you get in touch with our technical support team, who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports about the attempts made so far.Â
I hope this helps.
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